Hope you found an answer. However, just in case, I use focused breathing. Remaining focused on my breathing allows me to get where i'm trying to be, relaxed.  Like most things I do, it took practice. But, it does work, for me. Best of luck.

Meditative practices based on bodily sensations (e.g., breath coming in and going out) or the touch of the hands on your lap are wonderful anchors for practice of mindfulness meditation.  Aphantasia is not an obstacle to cultivation of deep meditative consciousness.  

As far as I understand, the goal of the visual images is to help you relax by bringing up positive feelings most people associate with certain types of images/landscapes/sounds... Sounds are a great alternative (e.g listening to rain falling on leaves). There are also a couple of active meditation techniques which focus on your body rather than the mind. While running, dancing, singing or just moving in general you can release tension.

I have found guided body scans to be helpful. I also respond well sound frequency mediation, right now 40Hz is my go-to. 

I meditate daily without visualization. Migrate towards meditation that wants you to quiet your mind. Since I can't see pictures it seems like it is much easier to quiet my thoughts than what I was led to believe. With practice I can now go for long periods of time without a single thought.

Ānāpānasati (breathing meditation) is one of the simplest paths of meditation, it takes time and patience to become good at though. The basic premise is simple, breathing is something we are almost totally unaware of even though we're doing it 24/7 yet it is something which we can take control of consciously almost any time we want. Bringing your breathing to your intentional awareness for long periods of time is the first step in learning to draw your attention to other things in your conciousness that you don't normally notice but have always been there. In Buddhist tradition it's one of if not the most fundamental form of meditation. Clearing the distraction is the hard part for anyone and again it takes time and patience to do that. A lot of Western guided visualization meditation I think is more about filling the mind with desired noise rather than seeing what's there for what's there. Notice the distractions acknowledge them and then let them pass as you draw your attention back to the breathe. Given than visualization is only one small aspect of our conciousness Western meditation practices focus on it way too much. Then again a lot of Western meditation is based on guided meditation which is the only way they can make money off of it. All meditation at the end of the day is an inward journey you have to take yourself. It could takes weeks or months to be able to do this for any length of time while learning to quiet the rest of the distractions that come into your mind enough to start noticing other things, note the nature of the distraction realize that it's occurring and let it pass returning your focus to the breathe over and over again until all that remains is the breathe.

Harry, I have the same question. I have been trying to follow the lessons from the book, "The Master Key System", by Charles Haanel, and I'm struggling to implement visualization. So I don't have the answer to, are there alternatives? Instead, I want to learn how to visualize. I just picked up another book entitled, "The Einstein Factor ", by Dr. Win Wenger.  He offers a method that helps develop the ability to see things in our mind's eye. Just starting to work on it. No dramatic changes yet. Hopefully, others will have a better answer to your question.   

Hope you found an answer. However, just in case, I use focused breathing. Remaining focused on my breathing allows me to get where i'm trying to be, relaxed.  Like most things I do, it took practice. But, it does work, for me. Best of luck.

Meditative practices based on bodily sensations (e.g., breath coming in and going out) or the touch of the hands on your lap are wonderful anchors for practice of mindfulness meditation.  Aphantasia is not an obstacle to cultivation of deep meditative consciousness.  

As far as I understand, the goal of the visual images is to help you relax by bringing up positive feelings most people associate with certain types of images/landscapes/sounds... Sounds are a great alternative (e.g listening to rain falling on leaves). There are also a couple of active meditation techniques which focus on your body rather than the mind. While running, dancing, singing or just moving in general you can release tension.

I have found guided body scans to be helpful. I also respond well sound frequency mediation, right now 40Hz is my go-to. 

I meditate daily without visualization. Migrate towards meditation that wants you to quiet your mind. Since I can't see pictures it seems like it is much easier to quiet my thoughts than what I was led to believe. With practice I can now go for long periods of time without a single thought.

Ānāpānasati (breathing meditation) is one of the simplest paths of meditation, it takes time and patience to become good at though. The basic premise is simple, breathing is something we are almost totally unaware of even though we're doing it 24/7 yet it is something which we can take control of consciously almost any time we want. Bringing your breathing to your intentional awareness for long periods of time is the first step in learning to draw your attention to other things in your conciousness that you don't normally notice but have always been there. In Buddhist tradition it's one of if not the most fundamental form of meditation. Clearing the distraction is the hard part for anyone and again it takes time and patience to do that. A lot of Western guided visualization meditation I think is more about filling the mind with desired noise rather than seeing what's there for what's there. Notice the distractions acknowledge them and then let them pass as you draw your attention back to the breathe. Given than visualization is only one small aspect of our conciousness Western meditation practices focus on it way too much. Then again a lot of Western meditation is based on guided meditation which is the only way they can make money off of it. All meditation at the end of the day is an inward journey you have to take yourself. It could takes weeks or months to be able to do this for any length of time while learning to quiet the rest of the distractions that come into your mind enough to start noticing other things, note the nature of the distraction realize that it's occurring and let it pass returning your focus to the breathe over and over again until all that remains is the breathe.

Harry, I have the same question. I have been trying to follow the lessons from the book, "The Master Key System", by Charles Haanel, and I'm struggling to implement visualization. So I don't have the answer to, are there alternatives? Instead, I want to learn how to visualize. I just picked up another book entitled, "The Einstein Factor ", by Dr. Win Wenger.  He offers a method that helps develop the ability to see things in our mind's eye. Just starting to work on it. No dramatic changes yet. Hopefully, others will have a better answer to your question.