If I were building this, I wouldn't integrate the floor pedal with the electric controller. Instead I would have a steering wheel mounted potentiometer and ADC with some sort of wireless communication back to the pusher controller. Or maybe it is easier to just use the existing throttle, especially if it's already throttle by wire. You already have to have the car switched "on" so that turn signals work, so you should be able to read the throttle position.
I've only built a small EV, so I have no experience with trying to integrate one with a conventional car.
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