So...
I've been giving this some thought for a few days. We have a family member who is very low functioning CP. I get that you want some freedom and something more than staring at a computer screen. But I don't think your goal is insurmountable.
Here's what I'll offer... because I know finances suck. If you can get to Florida, house and feed yourself and if your doctor says you can do some limited diving like 1 ata (33') I'll do your class, cover the online costs and take care of gear rental. I'll even cover the cost of the dives. You just have to cover your room and board and transportation. There's no deadline to this, so if you're interested, start saving your money.