Yes, a lot of cars here in Japan has aftermarket head units thanks to widely adopted 2DIN de facto standards. It's getting trickier as manufacturers copy Tesla more aggressively but if your car has a non-integrated A/C panel, separate from the main touchscreen, chances are the screen can be swapped out for something.
Yeah, AC is totally separate. This is good news. 2DIN will even carry over the camera data? I had no idea it could be that easy. I wonder if I could get CarPlay in this thing. Thanks for mentioning this!