I was listing the easiest and longest staying visa they could get while they're still in their country.
Here's the requirements on the Sydney website for the O-A visa,
It's still the way I'd go if I was going for a long stay here. I wouldn't even fool with a Non-O and then a yearly extension at the immigration office. I;d cut them right out of the loop entirely and get the O-A
**************************************************************
*****
-VISAS.html