Just disconnect or shield the wifi or cell antenna used for remote access. For bonus points plumb in a repeater/firewall to filter any traffic you want.
This is a cute hacker-mindset solution until it voids your warranty and/or you don't get an update you actually did want to keep your car safe.
The solution to this issue isn't treating the car manufacturer as a hostile party and trying weird tricks to circumvent their future actions. The solution is ensuring that the car manufacturer isn't hostile in the first place.
Ideally I'd like to do that with market forces, but that requires the average consumer to understand a lot more about the technology and its implications than is realistic so they can protect themselves.
A more realistic alternative is probably statutory regulation and penalties for non-compliance that can become an existential threat to the manufacturer's business.
I completely agree. I'm firmly in the "do not want" camp with a lot of this stuff. I find very few of the modern electronic distractions to be useful or desirable anyway, and I find approximately none of them useful or desirable enough to justify risking safety, security or privacy.
