And as soon as that car hits the second hand market, the next owner can find the appropriate relay, tap in a switch, and solve the rent to use problem.
Lots of learning from the EV conversion market will go directly into that ecosystem too I feel. But that said, I'm pretty sure that it's already illegal in many countries to tamper with the ECU. It's currently because you can change the emissions profile of the car, but I'm sure they'll just swap to saying it's about safety instead for EVs.