How to present a degree that was earned abroad on a business card?
I suggest that you present it as it was awarded, and perhaps list the university as well. Most people will accept it at face value, though you may get the occasional question about what it means. 

Australia isn't so isolated that it can't accept international terminology. 

This would be different if you are in a field that requires certain certification, but that is a question to be directed at those providing the cert.