I am in the same boat here, looking at adding an alpine head unit, on their website they state that if your car has BT steering wheel controls, they will work with their unit with the use of an adapter such as PAC or axxess, but I haven't been able to find anyone who has done it.
been doing a bit of reading, the axxess steering wheel module does seem to support BT steering wheel controls,
from the installation instructions:
For vehicles with OE Bluetooth buttons please press hang up or pick up on your steering wheel control after the LED on the ASWC-1 goes solid. If the OE Bluetooth buttons are able to be used, the LED will go out after three seconds. Your OE Bluetooth buttons are now programmed to your aftermarket radios Bluetooth buttons. (Aftermarket radio must have Bluetooth capabilities)
the data-link maestro also states that it supports this. I am going with the access as they offer a wiring harness adaptor that has the steering wheel and aux input pre-wired.
oh, I just read post #401, sounds like the bluetooth worked for Johnny Utah, that was my final question answered, been holding off going aftermarket until I was certain, just ordered an Alpine ICS-X7, hopefully I will be able to get it all installed by memorial day or so.