Hi,
I have the same as you (Symphony II+ and BOSE) and I just fitted OEM Audi Bluetooth. Recoded the steering wheel and the DIS. I bought it off ebay for a steal - £150...
So it can be done! I can post links to some guides I used, if you want...
On the other hand, if you want to go down the 3rd party route, have a look at the Parrot stuff, especially the Parrot Multican as this will interface with the s/w controls.
One thing it won't do, which the OEM kit does:
1) Numbers / phonebook in the DIS
2) Reduce the AC fan speed when you are using the 'phone
HTH,
fM
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