On the Vanuata front,
Let's say 100 agri support workers coming from Vanuata to work on regional properties. There is no COVID in Vanuata (as I understand), so why not let them in quarantine free? Maybe do the full PPE transport this just to get them out of airport and city and drive them straight onto the farm. Then they go to work immediately and no quarantine and no issues? Just in case they can't leave the farm for 14 days, and to be even more careful, likewise any staff or owners of the farm can't leave the farm for next 14 days as well. Farm owners surely could live with that.
1 in a Billion chance somehow they could COVID, but even if they did, they are in the middle of regional Australia, very likely very remote, with no movement of people.
ZERO Risk.