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One solution would be to use the pins in the middle connector at the headunit, which are used for the original BT system. Although I have a satnav bt Executive, I've been fiddling with the pins and I managed to fool the radio into thinking it is the BT and audio inputs worked, but the shame is that this input is only mono. I believe that all the HUs are able to do this.
If you have any questions about the pinouts, I'd be glad to give you some information in the following days.
BTW, audio inputs from the satnav are also hackable and come in stereo, but you can't control the volume through the HU and there is still the problem of maintaining the mute signal.
Andrej
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