I believe all you have to do is set things the way you want them (in your case this would mean just setting it to Driver 1) then hold down the Driver 2 button until it beeps. (make sure you have the parking brake on).
I hadn't tried having the parking brake set before. But that didn't make any difference. As soon as the second beep of driver 2 sounds, the radio and A/C settings go to the driver 2 defaults. The seat and mirror positions don't change, just the radio and A/C.