I still think it ought to be possible to modify the system to add inputs....
Something I've been meaning to look into on the 2006 although, given that there's no reason to keep that other than to avoid putting some modern carbuncle bristling with blue LEDs into the dash, there's less motivation than with a 2015.
Fitting my line level outputs revealed that there's a chip that does input selection, tone and gain controls and spits the audio out again in a 2006:
http://www.omegaowners.com/forum/index.php?topic=90541.0It
may be possible to use one of the inputs into that, and the setup on a 2015
might be similar.
Even if you can't use that to select another input, you could probably watch its' I2C lines to detect when phone mute and nav messages are active and mux the audio elsewhere..
I think it'd be pretty crazy to retro fit a Bose system for sound quality. Aftermarket amp and speakers are the way to go here, and either fit some line level outputs or feed them from the speaker outs.
I bought a bust Alpine MRV-F407 on Ebay for less than 20 quid. Couple of quid's worth of MOSFETs to replace the output stage that some chav had no doubt tortured to death and it's as good as gold... surely the route for a man of your calibre, Max.
