Usually, the efficient goal oriented are dumb enough like ebikes. I am guessing investing in Aptera would be a great option for a to b daily driving. Aside from that, custom computer to control the car is the most logical step until you get into electric or hybrid type vehicles where the aftermarket is not big enough. Removing wireless connectivity fuses are another option but I don’t know if a service shop will connect the fuses defeating your privacy. Also a phone app will always be anti privacy. Make sure to get products without apps or wireless connection capabilities as manufacturers start preventing you from using products without registering it with an app first.
Which clues us in on why Britain wanted to leave. Those in power want more power over their domain, and that includes privacy invasive regulations and laws.