Restomods. That is where an old vehicle, is upgraded with a modern engine/drivetrain/brakes, suspension, etc.
For instance, my 71 VW SB, I've debated doing the Subug swap (Subaru engine in the VW), with a full brake upgrade (four disc brakes, dual master cylinder). The power upgrade would also allow for a/c.
I do know of one instance, where a person tried to get just a physical key, for entry and starting the vehicle and couldn't. The company couldn't understand why they needed it, until they found out surfer, with no place to keep a key dry.