I see Australia Day as a bit political as there always seems to be a lot of controversy on that day. However, I agree with you, that soliciting games using aboriginal traditions and dreamtime stories would be very interesting, and may be a good way to preserve some of these traditional and stories, or make them accessible beyond textbooks or a plaque in a museum.
Let me think about how to do it without courting controversy. I'm not sure if it would be offensive for non-Aborigines to co-opt those traditions in their own game, or if it would be welcome if treated with respect? It's a bit of a hot potato.
I just want the system to not grossly offend anyone, which is perhaps an impossible goal. For starters, do you know anyone personally that might be persuaded to make such a game if such a jam were to exist? Are they Aborigine? Do you know if Aborigines (generally speaking) are happy for their traditions to be used in such a matter?
It's a good idea, but it needs some additional consideration.