Well had no luck finding anyone in country NSW to help with my wiring harness problem, so I had a crack myself. I opened up my old cd player and saw how the wiring harness was connected (quite simply by two plugs) so I unpluged the US one and pluged in the Aus one, unfortunately when I plugged it into the head unit it blew a fuse

Obviously there is a difference between the US and Aus harness but the actual circuit board and connectors looked identical, even if the software was different I wouldn't expect it to shite itself. I've attached a pic of the US wiring harness and the original Oz spec circuit board, any help would be greatly appreciated