I finally managed to get BT streaming with the S6!!! Total cost was about $175. Here’s what I did:
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update MMI SW from 3360 > 4410 (US version)
see: https://www.ebay.com/itm/Do-it-yourself-Kit-MMI-Bluetooth-Update-for-2004-2008-Audi-A6-A8-Q7-A5/273409816452
(h/t LakeTahoeQuattro)
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installed BT streaming device
see: https://www.ebay.com/itm/Bluetooth-Handsfree-USB-SD-Adapter-MP3-Player-for-Audi-A6-C6-2005-2009-MMI-2G/222859924039
The installation was pretty basic – just take out the glove box to get to the CD Changer. My only problem was a blown fuse that took awhile to track down. To access USB, I ran a USB extender cable from the inside of the glove box. Here’s a vid they referenced (not the same device): https://youtu.be/M62P7jgvXQQ
Once installed, I have disc 1-6 on the CD Changer, and then (virtual) disc 7-11 for USB or SD card. Disc 12 toggles between Bluetooth streaming and USB/SD/AUX. I didn’t test AUX because I didn’t have a source. It is supposed to work together with the OEM BT phone by setting a DIP switch, but I didn’t test that.
Audio quality is fine, but it takes a couple extra seconds to recognize the USB discs, and also to connect over BT. But song titles are shown on the screen and the next/prev buttons work.
All in all, I’m happy with the early returns.