So far, and what has worked for everybody else, is to not log in with your chip on.
But being that you're no newb, and that you already know that.... we'll have to do what we have always done and worked.
Unless the AU has some sort of HD scanning software (Not for content but probably for HD size) nothing will happen just as long as you respect the theorys, and the basics of xbox live with a modded xbox.
I wouldn't worry about it. You're also not giving anybody a reason to report you as a cheater, since you're not cheating. Just keep it clean, wait and see, I guess.
By the way, did bungie released what the AU release date is ?