Hi RedGTiVR6,
More boxes maybe - and you effectively spot an error in my thinking perhaps!
For clarity, I don't want an Alpine unit on view. I don't want buttons in my overhead install. What I want is a discreet interior, with a few buttons added in appropriate places - in the same style and illumination as VW.
Maybe one more box (the passthrough) but hidden..
Maybe sharing my idea on this forum was a bad one - I get really defensive at times like this
P.S. With optocouplers as switches, you can mimic a button push, and you can add graphics to the memories describing your settings.