No such thing as a frozen ATPL here. You either have one,or you don't. So not sure what they were selling you there!
What is worth doing in Aus is the PPL and hour building up to 175. Do the rest modular where you are going to be working. Don't bother with the Australian CPL/IR and then "converting" as you will need to do most of it again over there, and quite rightly, it's a completely different environment, chalk and cheese.
I know this because I hold have flown commercially in UK, Europe and Australia.
That way your hour building can be combined with the holiday of a lifetime before getting down to the hard slog and REAL bad weather!