pullup bar from wheelchair idea, logical possibilities?

I have a pullup bar that's not too high, my right hand can grasp it no problem but my left hand can't. But am thinking if I can find some kind of glove that will fasten my left hand to the bar, I could recline my chair and use the bar to assist me practicing sitting up. And hopefully wok my arms and back the same time (do pullups work the back?) And hoping if my hands are securely holding the bar while sitting that I cold also try to stand up using my legs and arms and once I get there practice squats. It seems if I could get figured out to get my hands secure on the bar that there would be several things I could practice for great improvements. It may not be easy to start but I see logical unimaginable potential. And it would make the most of working several muscle groups at once, making the most of the time. Thoughts on this idea appreciated. And the best easiest kind of glove for grasp if anyone knows.