I taught someone in a similar situation. This was in the UK. We got the TX built by someone in Southhampton. This is all about 15 years back so I don't know if Southampton guy is still in business.

Something to consider is learning to fly with rudder and ailerons coupled with throttle on a left slider. We added a little vertical extension so he could operate the slider using his little finger.

Would you be interested in PM or email with him. He is one of the good guys and I have enormous respect for him. He lost a leg in the accident and has a totally paralyzed arm. He builds all the time and is currently 3/4s of the way through a B 17 build.

The pic shows him taking his BMFA A certificate flight exam.