yeah you describe exactly what puts me off from it, I keep thinking about it and I practise with VR simulator and stuff but I give up after a while, either become too tired and lose motivation or my feet muscles become too tired and inflamed. I picked up the driving habit though after a couple of years of driving mobility scooters, from that I moved onto ebikes because I started venturing further out of town to go fishing etc and I found it was a bit tedious and dangerous averaging 6mph.
From my experience i'd recommend electric bikes for people with mild to moderate cfs that don't have consistent orthostatic intolerance or issues standing up for long periods ( I used to have it bad but now its only occasional ),
Its really dependent on where you live but often you can stay out of confusing or fast traffic flows.
Depending on the bike they can be light enough to lift, and you can often turn around quickly or leave the road at high speed without falling off or damaging the bike. I think i've done 2000 to 3000 miles on my current one which is just a modified mountain / trail sport bike. I used to cycle a lot before I became ill and this is the closest thing to that experience. I rarely ever turn the pedals I just use a twist grip thing with a hall sensor,
most of those commercial bikes are designed to be PAS which means it amplifies any physical effort you put into it. I'm making my own bike now from scratch but I think it will take months, its something to do at least.
If you are in America its pretty easy to get a good bike commercially, the laws are more relaxed there Hidden Motocross Track in the Mountains
You can go to the shops with these if you have a backpack, and some bikes have storage areas like the super 73, but you have to be careful because they are quite a big attraction to thieves.