OK4Wire,
IMHO, that won't happen; as far as I know there are no 02/20 or 13/31 runways in Oz so that there can be no confusion if you reverse the numbers. They might change the designations to 03/21 eventually when there's a change past 016/196m too, I don't know 021/201 at some future date.
Yes, I know it's reasonably common internationally but there's also been confusion at times with crews and ATC speaking a second language; I've experienced it myself whilst operating internationally and having ATC reverse the runway designation between radio calls. Not fun when the work load is getting up.