Do a lot of flying in premium cabins in a short space of time

Qantas do not have things like AAs candy thief challenge nor are likely to match status. I dont see the prob really anyway; by having Executive Platinum status with AA you have just about all the benefits that you would have as a QF Platinum.

Also I would seriously consider whether you would be better off staying with the AA scheme due to the much better value for redemptions that AA offers

Dave