Salamun Alaikum Munir Rana,
Allah does not burden a soul beyond its ability as mentioned many times in the Quran. Most importantly, Allah knows your capabilities and truly what is in your heart.
I would imagine every mosque would have chairs, and many do use them who are not able to stand up, bow or prostate.
In my opinion is very permissible, I know someone who Is on a bed 24/7 on life support for the past 5 years who even is unable to talk, or move at all, but is awake and prays to Allah from their heart when ever she hears the Azan.