Fin, You need to search the CASA website for the "Basic Guidelines for Overseas Applicants Applying for an Australian Air Transport Pilot
Licence [ATP(A)L)]."
Relevant parts include:
CASA does not recognise any overseas military qualifications. Applicants must first convert their military qualifications to the civilian equivalent in their home country before applying to CASA for recognition. CASA will recognise foreign military flight time accrued).
AND:
CASA does not recognise an overseas pilot’s theory credits [in isolation] if the pilot has not been issued with the actual licence nor does it recognise “frozen” licences
Whether or not the CAA/JAA would accept a type rating course completed in Oz to 'unfreeze' a CPL/IR is another matter; I don't think they would.