In all honesty mate, I don't know why you would choose to do that! Sure, your obviously looking for a bit of a stir, bit of a laugh, but aren't you just putting yourself offside (see what I did there) with the crowd straight away on purpose? You could have 99% of the fans enjoy and take part in the banter, but the 1% woudl be your lasting memory.
I consider myself the first fan to talk to the opposition supporters, share a bit of banter and enjoy myself. But if I saw some Aussie supporter wearing a McCaw is a cheat attire, I'd just avoid him as if you ask me your just looking for trouble.
Lose lose situation if you ask me, but each to their own, I suppose.