I wonder if you can retrofit a oem passenger side window and switch into the newer cars. I use mirror tilt for reverse parking because the backup lines are a little off.
If you turned off the car the day before and Pandora was working and not mess with your phones bluetooth or wifi it should connect automatically when you start it again. If it doesn't open up car play then you can put it into Comfort Mode real quick to reset the screen.
It sometimes likes it...