So that you're clear, you can play on the European region from Australia
And as you are aware, the AU server is tied to the Americas region, but even if the AU server was tied to the European region in anyway, if the host of the game is outside of Australia, you will still get bad ping. This because the game instance is hosted on the server closest to the leader of the party. And if you were the host on the AU server, all your EU friends will have bad ping so someone will lose out because of the geographical distance.
But I concur with the advice on getting out and about more while you're in Australia, and just spend the 40-60hrs getting the stash tab in Seasons so you don't miss out.
And yes, there are lots of animals in Australia that can kill you... you just need to be mindful of these things depending on where you're venturing to.