My opinion is that you’re going about this the wrong way. Instead of doing an apprenticeship go in as a trade’s assistant. I sure no employer wants to put a 30+ year old guy into an apprenticeship as they know they are consigning him into 4 years of indentured slavery . You cannot maintain the lifestyle of an adult on those wages.
CASA requires 21+ years of age, Exam basics, Speak English and 4 years’ experience. NOT a cert IV OR an apprenticeship
There are plenty of jobs out there. Some hangar's look like retirement homes, we always need fresh blood!