I'm not sure how the Aussie's run their stuff but I see a big issue in running our boot camp co-ed. Bathrooms have no stalls or doors. Every movement is regulated. You shower in an open room. Half the time you walk in a circle through the room of shower heads and they call that a shower. The "lucky" times you get soap, you are instructed when and how long to soap an area and when to rinse, which is always like one second.The platoon upstairs from mine at the First Recruit Training Battalion was mixed male and female in 1996.
Half of that platoon joined my platoon for Infantry Employment Training 3 months later. They were as well prepared for that course as we were.
Mixed Infantry platoons, that's going to be an issue. Mixed recruit platoons? Total non event.
So to integrate there would need to be a lot of changes. "Standards" per say might not drop. But the overall intensity of boot camp would significatly.