Kaylee Lowe’s answer to How can I get Esperanto taught at my school? Read now for the general principles at work. This answer is the added detail.
Kaylee Lowe correctly points out the added constraint of standardised testing and curriculum support; you can’t just waltz in to a school with a copy of Jen Nia Mondo, and start talking. There are accountability constraints at work.
Australia has adopted a national curriculum, and a lot of time has been spent hammering Ancient Greek and Indigenous Language curricula into shape; if there isn’t provision for Esperanto there, most schools would be reluctant to deviate from the national course.
Add that in Australia, State schools don’t have that much autonomy in what they offer, and Catholic schools don’t have that much more.
Honestly, your best bet is to talk to the local Council for Adult Education, and get it offered there. Esperanto was in fact offered in Australian schools in the 1970s (Morwell High School: here’s a description from an alumnus), but we’re not in the 1970s; things in education are much more tightly controlled. And that’s not necessarily a bad thing. From the description:
Trouble was, Ivan had to cajole other teachers into taking the classes – he taught them the lesson one day,and they taught it to us the next! We had one text book, and we began at page 1 in Form 1, and began at the same page 1 in Form 2. It is the only subject in which I ever ‘cheated’ – as did most of the class. Sorry Ivan, but we thought it was a bit of a joke. It was a compulsory subject in Form 1 and 2, in Form 3 if we took French we also had to take Esperanto. In Form 4 I opted out of French because although I enjoyed the subject I didn’t particularly like the teacher – but guess what, that year if you didn’t take French you had to take Esperanto. I was finally free of it in Form 5. But in four years we only ever used the one text book, and always started from page 1! It was a small tan coloured soft covered book.
Oh well.
Bonan sukceson, kaj bonvolu komuniki al mi pri pli da detajloj!