I recall hearing of someone who had a similar issue about this before. The problem being that the oz flying schools, by the regs, can only do the language proficiency for the issue of an Australian licence. Maybe it's changed since so if anyone knows different, please post the up to date info.
Speak to the school where you will be doing your CofV or hiring from to get their advice before you head out.
Welcome to dealing with CASA and remember their motto "We're not happy until you're not happy"