could you use for example the ipod adapter that BMW/Mini uses???
I installed this my self on the mini, and as far as i can tell from it (i am not electrical engieer), you are replacing four wires on the main radio harness. Signal, power, ground, and what i assume is controls.
so since these four cables exist really in any radio, it should be possible, right??
this is the best thing in the world, you connect the ipod throw it in the glove box and forget about it for 3 years, it charges and you control it from the radio.
kit is $250.00