You do get that these are seasonal jobs, right? Come April or May these aircraft will be going back to Canada and the jobs along with them.
That said, an actual knowledgeable flight operations outfit would have been ahead of the curve on this caper, even to the extent of getting Transport Canada to do an expedited licence/endorsement for Australian pilots to fly these specific aeroplanes in Australia. I have had several such limited waivers from foreign regulators over the years.