"Currency" may be a term lost in translation. Since a FAA pilot certificate is good for life (unless you do something really stupid and the FAA takes it back) we 'Merrican pilots think of currency as 3 TOs and landings in 90 days, however many approaches and holds for IFR flights in the last 6 months (or a checkride) and a flight review (or something that fills the square) in the last 24 months.
I don't understand how other CAAs do it but I see questions here about revalidating a license. The FAA says if you can fly on your foreign license your FAA cert is good. But in their guidance to the FSDO is a note to remind the pilot getting a 61.75 that they need a FR before using it. And the FAA definition of a FR is one given by a FAA CFI.
Does Oz require a FR? Scoring would be finding someone who does the OZ FR who also holds a FAA CFI and can sign it off.