I seem to recall...
Many years ago at an Oregon EAA State fly-in, there was an RV-6 that had no rudder pedals. Rudder was controlled by a twist grip (think motorcycle) incorporated into the stick grip.
Pilot rolled up to his aircraft in his wheel chair, hopped up onto the wing, folded up the chair, placed chair in baggage compartment, then he "got in" the pilots seat, closed up, powered up, and departed. I will admit that I had a tear in my eye, for multiple reasons, as he departed.
I think there was an article in one of the RVaviator newsletters, and also an article in Sport Aviation on this plane and pilot.