Here is an update on the legal challenge being made to US vaccination mandates. There may be some points of interest here to Australian attempts to do the same, but I don’t know much about Australian law. Still I hope this is still of interest. I think the focus on international human rights will need to be explored, as you Aussies do not have a Bill of rights. The external affairs clause of your constitution, might be the key. It was used against you, now use it!