One more thought. I have dealt with Africanized honey bees here in the US. It really is no fun. I have a photo of my husband’s sock with about 50 stingers embedded in it. This is just one side of the sock and I count about 26 stingers or remnants.
In that case, there is really only one way to go other than wiping out the hive.
Divide and Conquer.
Our hive was 2 deeps of brood, so we split it into 4 nuclei. A lot of work, but much easier to search for the queen in each, without being attacked too badly. Also, when they are smaller, they are lot more docile. When we found and dispatched the evil queen, we had a new queen and just recombined everything with newspaper. It worked great and the hive never misbehaved again.
It may also be that your hive is just too strong, so another option would be to split it 50/50. Not the best time of the season, however, QLD has a flow for much of the year, so you may be fine. Time for @JeffH’s input