Clipsal have a replacement power point that suits Aussie plugs. The total cost is around $40 per unit completed, and delivered to Australia. The advantage of this is that it's small and cables can run directly through the hole. I'm using HDMI & Cat 5 cables throughout most of the house and I didn't want to have a heap of connectors so now I can just run the cables direct.
I've often wished that these Monoprice wall plates were available with an Australian outlet, I never thought that it was possible to replace the outlet by itself! Which model Clipsal product are you using? Does it fit exactly right?
it's a straight fit from the clipsal catalogue.
I'll get the product code for you tomorrow. The cost was $13 each