sms777,
Mate, the DAMP rules apply at any airfield/aviation activity and it will be no fun for those on the receiving end of a positive test. Hiding ASIC/any sign of pilot identity will not help, if you get sprung.
Read the fine print, the rules don't necessarily only apply "airside", which, let's face it, can be a bit undefined at Birdsville.
Tootle pip!!