I know of some earlier mid 90s Commodores that had been reprogrammed to have two modes ("fun" and "legal/performance limited" for when the car was in for a service, tyres, etc), and I'm sure at least one of them was via the ignition key ID. I wasn't sure if anyone had tried it on the latest GM management systems. I thought it was at least worthwhile asking.
Most cars I’ve had, had a valet key that wont unlock the boot or glove box. It was a security thing when leaving the car with service, car wash or parking garage.
I’m not aware of any “normal“ cars that have a valet mode which reduces engine power or limits top speed. Supercars, yes, but not run of the mill cars which includes my VF Commodore Motorsport and the other LE variants. I believe GM has an electronic valet mode that does the same security boot/glovebox thing but does it electronically though our Holdens didn’t get this (unless) feature.
Come to think of it, didn’t a Ford Focus come with key personalisation where the parent could set the max volume on radio and set trips to be data logged and not deletable, all for a given (child’s) key... It was poorly marketed as a child friendly feature where parents could ensure their kids played nice when driving...
So buy a supercar for the family and ask for an exemption,... if COVID has taught us anything it is those with money can get all tne exemptions they want or need