I agree with you about the 12 poses not being for everyone. What I’ve done is adapt the poses for chair use as much as possible. Somewhere I’ve read (don’t ask where but it was from a trusted site because that’s all I read, ie Mayo, Harvard, Cleveland Clinic) that holding the pose for 40 seconds is what makes it effective. So thats what I do. It’s the muscle contraction that is sending the message to the bone to rebuild, put simply. Have you tried isometric exercise? I dont do weight lifting because of arthritis in my hands and wrist.

If you look for Dr Fishmans YouTube videos, he shows several alternatives to each exercise, based on skill and flexibility etc. if you go SLOW you may improve. I have been doing them for months and can now get up and down from the floor easily but it took months and consistency. I was terrified at how inflexible I had gotten and the fear of not being able to get up from a fall or even a chair was haunting me. Now I’m alternating with weights and my strength is increasing SLOWLY. Believe me, the pitiful starting was demoralizing A LOT!… but I only have me to blame if I don’t try… so here we are!
Do research snd don’t cross off things from your list too quickly. You may find you CAN—even just a little!! It might take time, but so what?! It is all better than NOTHING, which is unacceptable.
Blessings…

Have you found any videos that have you do some poses on a chair? Better a few on a chair than none at all??????