You'd need to steam distill Camphor plant material, especially old/aged plants, then separate the safrole from the constituents contained in white camphor oil, then use it in the chemical synthesis.
There's a bit more involved in the extraction, but - and I and others have said for years - it's definitely do-able. Depending upon the chosen route, all other chemicals are available OTC or can be made from OTC sourced chems.
So, logic would say that if imported MDMA is reduced due to increased LE and boarder patrol while a fat market still exists, then some producer somewhere will see the value in making it in Aus.
Even if the price dropped to a 10th of it's present street value, it would still prove a very viable venture for those so inclined, despite the process being such a 'long way round'. However, unlike meth from pseudo, there's no suspicious chems to buy, if they're obtained from OTC sources, so if an operation was clandestine enough, it could well escape the attention of LE.
The big question IMO is what sort of quality is a final product? Sure, extra steps could be performed to produce a cleaner product, but would these be done when there's already such an extensive degree of work required to produce the drug via such means?
Drugs are bad - Prohibitionists have told us, and just to drive home the point, they've now made them more so.