I was able to change to Voice to American_Jack, with Text & Keyboard to American and also British English and all worked OK.
When changing back to Australian Voice it seemed that having the keyboard set to American English was causing the voice to flip back to American Jack and it took a couple of attempts and force stop of the app before Australian_Lee would stick but otherwise nothing else seems to have messed up.
Cyclops & JVC continued to work OK with any combination.