Biscuit, do you have a link to the Australian analog act? The reason I ask is that with the american analog act the compound must have substantially similar pharmacology to a scheduled compound as well as structural similarity. Since 6-apb appears to be unknown as a psychoactive in any scientific publication, a prosecution I would think would be very difficult in the US at least until such research is done and I don't believe any jurisdiction in the US is willing to devote the resources necessary to determine the human pharmacology for a simple possession charge. I believe this could possibly be the reason why 6-apb was selected as opposed to 6-apdb since 6-apdb is a known psychoactive and would fall under the US analog act. There's quite possibly cultivated plants which may produce compounds which would fall under the US analog act but since these compounds are unknown to scientific literature it would be impossible to prosecute, and a couple reports on online forums I doubt would establish pharmacology beyond a reasonable doubt. There's reports on erowid of people getting high off all sorts of things that I wouldn't consider psychoactive, and even if it was it still does not determine whether the effect is "substantially similar to or greater than" MDA.
Also, in the US prosecution for the importation of drug cannabis seed seems to require proof that the person being charged had knowingly requested the seeds. For example, the DEA intercepted letters placing orders with one well known Canadian seed vendor and sent letters back requesting the vendor was busted and that the customer send western union funds to an undercover DEA agent to get their original order so they could prove the person requested the seeds. Without this evidence, prosecution would be much more difficult.
I don't know how this applies to people in Australia however. Also, I'm not trying to make the claim that purchasing this compound in the US is safe, I'm just citing a few things for the record. Unfortunately, selling the compound in the form of pressed pills will work to the advantage of prosecutors since a pill is obviously intended for consumption.