Automobile Enthusiasts

Which has been rebranded as a power port.
They are stand alone. All turn on when the car turns on and don't access the native computer systems. So there should be some available. But with tariffs who knows what cost and available.
The mirror device has an issue that doesn't bother him. It only has Chinese labels and can't be changed to another language.
When he sets up his phone for navigation everything shows up in German and Chinese, audio is German for the cars navigation.

You might look for car groups for ideas.