It would depend on how quickly British wizarding settlers got to Australia and what their attitude towards multiculturalism is. I would imagine that they, at least initially, would have been none too friendly to the Aborigine population much less other immigrant groups.
Do wizarding schools see themselves as more traditional, even when it comes to their food? Do they not even recognize 'multi-culturalism' the way Muggles do? The subject of planning a menu just got excedingly more complicated!