Fit Parott 3000 evolution

HI,

Got a 2006 Octavia with a Stream head unit, want to fit a Parrott CK 3000 Evo bluetooth kit in it.

Want to input phone audio into the head unit through the dedicated port on the back (using the right connector) and need a solution for getting the "high level out" from the car kit to low level.

I don't want to use a SOT lead via the Mini ISO's, too bulky and like the concept of using the head unit to provide the sound.

Andy