OK so...
You need to email CASA and fill out the paperwork, I believe you can do an AVID instead of an ASIC so that will sort you out for the id part of things...
Once paperwork is accepted you will be authorised to do AHUF and AOSA atpl level exams, IREX needs to be done as well.
Do that, pass it then you can book in the flight test and go from there...
[email protected] send your information to this email address (License type conversion wanted, ARN if you have one and any ratings you want to bring over as well)