Darren Palmer was on the Inside EV podcast as a guest a few weeks back. He said any improvements would also apply to MME's already on the road.
The great thing with these vehicles is they can get better over time.
The concern I would have is that the brakes are not used as much as an ICE vehicle. In the canadian north, I've had seized brake calipers when they are used for all of the vehicle's braking. Not sure how well the calipers will hold up in a BEV.
If you're worried about salt on the paint, my garage at home is heated and setup so that I can wash my vehicles in the winter.
I can pick up your Mach-E, drive it a couple of hundred km wash it and return it to you. 😀
A backup is good for sure. It will get old fast too having to take the cord out of the car to charge and put it back in when you leave. Don't want to forget that at home and get caught with your pants down without a method to charge if not near a charge station.:)
Hydro One has a 25% rebate on...
You mention wanting a dumb charger. Have you tried the mobile charger that came with the car to see if it improves the communication? That would depend also if the wall charger is a plug in that you can unplug and use the Nema 14-50 plug.