2010 9-3 Keeping factory bluetooth on aftermarket h/u without tel in?

[swifty]

well my title pretty much sums up my conundrum.. i have factory bluetooth fitted in my 9-3 and have just bought a new headunit for navigation (blaupunkt new york 800) only to find that it doesnt have a tel mute input :-(
i guess its because it has bluetooth built in but i dont want to use that as i will lose sid display for calls, steering controls, voice dial, and ill have to mess around fitting a new microphone somewhere.

my car has an external amplifier, and the blaupunkt harness i have allows steering control access for audio (vol, next &prev)..
can anyone suggest a way to just ignore the headunit bluetooth and fit some relay harness that could switch the audio from the h/u/ to the factory bluetooth when a call signal is seen?

im at a loss at the moment, so would appreciate any suggestions.

[swifty]

Ok.. well since it looks like that isn't a goer then how about getting a signal from the steering controls (the green/red ones for the phone) ?

I have an autoleads harness with steering controls adapter which works great for the volume etc.. but when I press the phone ones the car bluetooth reacts and I don't see anything at the stereo.

Does anyone know if this is a seperate wiring line for the controls on the left side of the steering wheel ?
My next plan is to integrate the phone steering controls with the stereo and utilise the Saab mic on the headunit instead of fitting the one it came with..