Sometimes there is person who do thing according to his/her ideals, naivety, goals without regard to his/her own country National interest. Just take a look at Duterte, as the best example. I think it is true Oz National interest largely put Indonesia as a more important bulkwark and fortress against the rising threat of China, compared to giving support for OPM/terrorist scum, but Oz had traditional democracy system in which we don't know what kind of leadership they can bred every election years, though the same case can happened in Indonesia but not every sane leadership in Indonesia would shot her/his carreer by giving attention to the idea of Papua independen unless he/she ready to become a traitor and sinner for seven or more families generation.
This, i am more on the stand to always put wary attitude against any state with such background, Singapore i believe they are reasonably are a very trusted partner we ever had till now as they even declined the offer of FPDA to sent any contingent troops to Timor Leste post 1998 with background to preserved Indonesia-Singapore cooperation albeit our excelency deceased Presiden once called them as Red Dot at the time, but Australia? they had wronged us once, i don't think it is wrong to put them into our own wary list.
There is nothing we can do but keep building our economy, building our military, keep diplomacy channel available every where to put pressure against any actor or state who give support for the idea of Papua independence like Vanuatu and some Melanesian countries. SBY initiative to engage MSG is excellent idea actually and we can do more than that, and we should be more wary of intention of two Super power (China and USA) more and use the available cards more clever.