If you check out the links I gave above, you'll see the adapter does only the stereo audio signal. The mic pins are essentially unused.
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I didn't want to rely on the auto/signal sensing. There is a remote turn on terminal as you are aware. I believe it has to be powered either way, not sure. I used the power feed that used to power the factory amp as the remote turn on signal. You could use any 12 volt accessory voltage though. Like the 12 volts that is in the harness for the left pocket accessory power outlet. You just want to be sure it is a voltage that only comes on with the ignition or accessory key position.
Best stereo upgrade so far is a good windshield and stock pipes !