@liztai well, to prove my own ignorance, after checking I see the recent meeting in Melbourne was a "ASEAN-Australia" Summit - which is to say a meeting of ASEAN with Australia.
i.e not Australia as part of ASEAN
While that somewhat makes my point, it's not quite how I wanted to.
Side note, I was walking to my office last week and was briefly prevented crossing a road by an ASEAN police escort on route to the meeting venue.