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.