Couple of points.
1. Its a tough call how you want to play the interview with the RAAF people. They want to hear you are totally committed to the RAAF and the fact that you are already thinking of life after RAAF will not go down well. They think of you as an officer first and ATC second. That said, honesty sometimes works if you shoot straight from the hip - you will need to think about that carefully.
2. For all intensive purposes your RAAF ATC expereince "offically" counts for practically nothing outside of australia. As described AsA are currently recognising expereince in the form of short courses for RAAFies. I moved to Canada after the RAAF and Canada's policy is that you must complete a knowledge exam which is essentially the same as what a student graduating from the training school must pass. Attending the ATC college however is waived. So generally past Military ATC expereince will get you a foot in the door for testing/interview, but the RAAF does not give you any sort of ICAO recognised licence so you will have some sort of testing/training when you go civilian.
Anything else PM me.
Stunty.