I know that they dont allow it down-under (aussy)
Not so. There's nothing at all to stop this at a non-controlled airport in Australia, and it is frequently used, although most pilots wouldn't know it by this name. The only places it's not allowed are where there is a specific local procedure (eg Camden aerodrome rules require joining the circuit on upwind)
At a non-controlled airport in Oz, helicopter pilots have two main options: (1) Join the circuit in the same way as aeroplanes, or (2) Avoid the circuit altogether (not above 500 AGL, don't cross centreline of an active runway, don't interfere with the circuit traffic, etc)