Not a problem, I think, since Europe, Asia and Australia are on the same GSM band. From wikipedia:
"Dual-band phones can cover GSM networks in pairs such as 900 and 1800 MHz frequencies (Europe, Asia, Australia and Brazil)" Since Asia is the most important market in the first place and Europe is pretty big for Meizu as well, I don't think it's a problem.
Regarding the adapter: Good chance the importer will take care of that, or (if not) you could always get one of those universal converters or something. Actually, if there IS an importer, you can count on the phone working in Australia as well.
Mind you: this all is not based on facts, just what seems likely to me.