In all honestly I'm not pushing my kufatec, wasn't aware of mono only but I only really used it for the phone briefly!
Bluetooth module needing 12V shouldn't be an issue to pick that up at the rear of the RNS-E, even using the dreaded scotch lock connectors
I am debating removing the RNS-E from the RS4 and going aftermarket, something with android auto/carplay. Reading this got me thinking about the art of the possible with the OEM unit.....
https://medium.com/@bendavey/bringin...i-3d7d3bd97d7a
I could see with the right CANBUS interface and time that could be made very cool