I can't answer specifically as I am a Secondary English teacher (from London, teaching in Sydney, 15 years experience). I have, however, run the gauntlet with AITSL, the federal body which is assigned the role of deciding which teachers enter the country and can proceed to applying for a visa. If my experience is anything to go by, in Australia, rules are rules. There will be no flexibility and they will not allow you through the AITSL gates unless you have exactly what they want - and have evidence (evidence, evidence, evidence) to prove what you claim. If you want to be in with a chance, you must get that experience before applying. Sorry, but AITSL is very, very rigorous. A word you will hear a lot out here is "compliance" - you'll need to comply with their requirements.
Good luck
agm