2000 A6 symphony/icelink adaptation

[Chris Cappuccio]

I just got a 2000 A6 from a friend who kept it well maintained. It has
the original Symphony radio. It also has a Denon Icelink in place of the
CD changer. This Icelink handles the iPod Classic, only. Apparently
it even runs an app on the iPod to provide titles to the head unit.

Is there any adapter that will bring bluetooth, sd/usb/mp3, or at least
a true aux input to the Icelink?

If not, is there anything that works with the original Symphony and
delivers sd/usb/mp3?

I found these on eBay:

http://www.ebay.com/itm/USB-SD-MP3-AUX-In-Adapter-AUDI-CD-changer-8-20-pin-Chorus-Concert-Symphony-1-2-/201599710787
http://www.ebay.com/itm/Bluetooth-USB-SD-MP3-Adapter-Hands-free-connection-AUDI-Chorus-Symphony-1-2-/191848786806
http://www.ebay.com/itm/XCarLink2-iPod-AUX-MP3-for-Audi-Concert-Chorus-Symphony-/231896799590

They are closest to what I want, but they seem pretty junky themselves,
32GB SD maximum and all... Then again, a usb flash larger than 32GB is
going to be pretty hard to search through on the CD changer interface.

Another option is to adapt the 30-pin iPod Classic interface (not the
same as 30-pin iPhone 4) to bluetooth or sd/usb. But I can't find
anything that works with the Denon Icelink.

Another option is to replace the Symphony 1 with a Symphony 3 or
something else. The Symphony 3 has newer, more useful interfaces available.
Is this a "drop-in" or, not so much?

Should I consider a 3rd party radio? 

Chris