Come on, he has a valid point. It does take a lot time for the NAV unit to boot up. Most times, I am already on the move before the camera kicks in.

Although I can't help with the solution, it's possible the radio is controlled with relay's but I suspect a microprocessor. I'm not sure what inputs the radio gets to turn on as it stays on even when the key is pulled from the ignition and doesn't turn off until the door is opened or a certain amount of time passes.

I think any back yard solution would be difficult in this vehicle, but I do applaud the OP to think and question it. Maybe an engineer at Ford may even see it and implement the idea in a future vehicle as it would be an upgrade IMO.

Johnny