I am not sure about the best way to purchase one and I doubt that one could be brought with an Aussie sticker, but you do not require an aussie sticker for the track http://www.nsw.cycling.org.au/site/cycling/nsw/downloads/2013%20Website%20Unsorted/NSW%202013%20tech%20regs.pdf
There's no mention on the web page as to which standards this helmet certified for2. In all track events competitors shall wear an approved AS2063, ANSI, Snell or EN approved helmet.
Of course the question begs is how much difference this helmet makes over a road helmet?
And I already have a rooster tail type pursuit helmet, so its only for mass start racing