What's illegal about a low-tech (aka "dumb") electric car? Is there a law that requires connectivity, or for manufacturers to abuse that connectivity?
That it can't meet regulatory safety standards. E.g. drowsiness detection or crash detection to call emergency services mean that any car can not be "low tech" in any meaningful sense. So the best thing you can possibly get is a high tech car, where user facing technologies have been removed. Needlessly to say, the market for that is miniscule.