Even setting aside development costs, any such kit would cost more than your car is worth. As for reliability, electric systems have issues too, especially besp

Even setting aside development costs, any such kit would cost more than your car is worth. As for reliability, electric systems have issues too, especially bespoke drop-in systems. Having fewer moving parts is great, but just because a part doesnt spin doesnt also mean it will never fail. Your maintenance costs would instantly be much higher the moment something goes. Whether IC or EV, getting a custom drivetrain repaired will never be cheap.