This is why I hate the online car owner forums. Car owners ask reasonable questions like these and people sneer in their replies saying "that's a horrible idea" as if somehow every car owner agreed to universal tracking into telemetry and is totally fine with it.
My daily is a 1997 Range Rover. You want to update the computer? Sure, you need to remove the desktop PC-sized box of 68HC11-family chips from under the driver's seat and desolder the two big 144-pin ones.