>>> "However the first thing that happens is it begins playing audio."

Yeah. In the same boat and my wife like to play pranks when she uses the car. Turns the volume to max right before removing the key. When her phone is not found it defaults to radio. That "saved me" from having to drink my morning coffee in the office on more than one occasion + it's good training for the heart.

Edit: Forgot to mention that the volume knob is ignored until the system fully boots up and the audio starts as soon as you twist the key.