Polair was a PVT / AWK OP when I was in it.......
Careflight Qld has a CHTR/AWK AoC for Lear 35 / 45, domestic & International, but not B200 or PC12.
Careflight Medical Services also charters aircraft from other operators like Pelair to conduct its retrievals.
I don't know that any of the Careflight operations in Oz has the necessary experience for a primary Aeromed service like NTAMS.... but I've been wrong before.