Our solution for driving without the use of the right leg is to install a second accelerator pedal identical to the original one left from the brake pedal.
A lighted push button placed on the dashboard enables the selection between both accelerator pedals only shortly after the start of the engine. When no selection is made, the original accelerator pedal on the right is always functional. This prevents any confusion when the car is driven by a driver using both feet.
Both accelerator pedals are never active at the same time.

electronic left foot accelerator pedal
left foot accelerator by kempf
Left foot accelerator pedal by Kempf
Kempf electronic left foot accelerator

electronic left foot accelerator by Kempf
Cars adapted