Does Australia follow the British Government in Exile? Follow America's lead? Bygones be bygones with Japan and Italy? A Independent Land Down Under? (That one I would support the most given the fate of Great Britain and the US failing to beat Japan won't give much faith in America and Canada for more Aussies.) Dealing with the untold number of Asians, Europeans, and Africans fleeing from Nazi and Japanese rule? Fascist and Communists? Fortress Australia? Dreamtime Nukes? March into Indonesia? Back the Indonesian rebels?
The problem for any Japanese detente is the fact the ANZACs are 100% surrounded by the Japanese on all sides