Hello,
Australia has pretty tight weapon laws, so it may be wise to contact Alan Maisey who will be able to tell in detail what import requirements need to be met with.
However, the most problematic part will be the ivory hilt - you'll need a lot of time and paperwork (as well as associated fees) every time you want to cross an international border with it (of course, this also applies for shipping). I'd certainly didn't want to risk confiscation of a family pusaka...
Regards,
Kai