Hello "guest".
I have three of these and have some seeds too. Like you I'm unsure as to when to sow, so I've just sown about a third of them. I'll do another third at the end of January, and what's left mid April. They'll go into a heated propagator.
Why not join up and share your photos.

Not sure if there is anyone from Australia on here but if you get no further here, I would email the botanic gardens at Perth (Western Australia where it comes from) and I'm sure you will get a response.

Good idea Fractal!
I would hate to waste the seeds through my stupidity, as they took about a year maybe for the fruits to reach maturity.