Hi all here's two solutions.
KRAM cables and extension from Strike - full functionality but a bit pricey,
or
got a solution today with a very competent installer - they use a separate speaker for the Bluetooth side of things and link the AUX output from the Parrott blue box to the AUX input in the car - means it's not quite as seemless when you want to play music as you have to select Aux in on the stereo as well, but no biggie for me and a saves $200 in KRAM cables and extension leads. They clearly have figured out how to do the muting with this solution but hope this may give others a hint on how to approach it in the future.
I now have this installed using the second option, all works fairly well, however volume with the separate speaker isn't easily adjusted, sound quality for calls is acceptable and usable but not as clear as using the stereo speakers. This may be because the new speaker is small and really tucked away.
Installer in Adelaide MobileTek did an excellent job - first class operation - I'd recommend them
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