The basic logic should be entirely contained in the back.
The artisan should take a normal Canon AE-1Program back, a "normal" Leica digital back, strip the electronics from the Leica, and putting it to the Canon. It might be not very hard to do for a specialist.
Some flying wires might take energy from the winder or the artisan might adapt a battery compartment to the back.
The final result should not look very attractive but it might be possible to do it.