If Sam cannot adapt (re-learn to drive) with his feet the proper way, this seems the next best option. Personally, I can't get on board with driving with the left or both feet; it's an extreme safety hazard. Using both feet can wind up "riding the brake" & driving with the brake lights on (especially if the pedals can't be felt), cause undo wear on the brakes, and reduce safe control. When crossed over, the left foot can get caught under the brake pedal; better to get/use a left foot accelerator pedal.

Google: adaptive driving for some safer solutions

Doc

Nothing wrong with left foot braking, Ive always driven auto's that way.
Know lots of other people that do as well. Seems natural to me, two pedals, two feet. Used to drive a van once that had the steering column between the pedals, was no way you could get your right foot on the brake.
Especially now I have PN I can leave my right foot on the gas.
Let foot isn't quite as bad so can still feel where the pedal is.
I have a paraplegic neighbour with hand control on his vehicle.
Had occation to drive it recently & it made my carple tunnel play up same as when riding a bike.
I agree with you re could be a hazzard.
Guy used to work with me years ago had a prosthetic right leg.
Got it under the brake pedal once & took out a motor bike, very nasty accident.