Mercedes-Benz Audio 10 CD - Bluetooth Integration

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Warning
For the best functionality, you'll need to program the Bluetooth Modules; for that, you’ll need a 15$ CSR USB SPI Programmer, and some quite decent soldering skills. Otherwise your module will advertise itself as having a microphone, and you'll have to toggle your phone off of bluetooth when on calls, which can get quite tedious after a while.
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Parts:
• Bluetooth 4.0 12V Module : bit.ly/2HGyGkW
70 Minute Silent Track : bit.ly/2r9RW3e
This is the best approach I've found to add Bluetooth to these radios.
The D2B CD Changer input is optical and uses a deprecated protocol, with no dongles available at the time of shooting this video (Apr. 2018); some dongles were available some 10 years ago, but even those were way too expensive to be economically viable for this application.
Some people use the AM radio as an entry point into the main Mixer IC, which has the benefit of not relying on any physical mechanism - so - this, in theory, is the best most elegant way of achieving this. However - I've tried it on an Audio 10 CC, and firstly, it's MONO audio, and secondly, and perhaps most importantly - it sounds like complete shit. The dynamic range is vastly reduced when using the AM input on that particular mixer chip (TDA7340G). This radio uses a TEA6880H, which at first look also has a mono input for AM.
Parts:
12V CSR8645 Bluetooth Module: ebay.to/2IfjVq9