Other than the loading/unloading of stuff, the rest of these can be handled with some code. Consider the tech stack of the average Tesla, including how they're always connected to the internet already. Tie the settings to your key in the cloud, and then create a UI to move key 123 from car 456 to car 789.

Syncing your driving prefs to your phone or to the cloud would be very interesting. Show the car a QR code as you walk up to it?

Your keycard / phone key can store your driver profile id that the car then uses to fetch the settings from the cloud. No QR code needed.

superchargers are not too bad. 30 mins at a charging station while you grab food and stretch your legs is all it takes.