We have a VW and it has anchors in 2 places - on the "panel" under the rear view mirror as well as between the seat backs and the seats. I think I also checked our Honda and I think it also has the same 2 anchors - I will check again tonight because I need to know anyway. I know you can use the front seat rails as anchor points in lieu of anchor points that would be on the floor of the back seat. The seat rails are just as secure as the real anchor points (I emailed the Swedish company that exports all the major European car seats to various countries including Australia). I'm not up on the terms for the various anchor points so I'm just describing them to you.

I agree that the law here makes no sense - and your research is correct - there is no rear facing Aus car seat that goes beyond 12kgs - it's crazy. If I was you, I'd bring in your seats and use them - but I'm not providing legal advice (although I find it hard to believe that the someone's child was taken away because they were rear facing at an older age) and you will have to weigh the benefits and risks like I have.