A small problem to overcome will be taking enough fuel to return to Perth from a strip with no fuel. 1.5 hours out 1.5 back and you start getting into the larger aircraft area. Thats why the hawker is such a good machine. It can go anywhere in the Pilbara or even Broome with return fuel.
I guess the biggest benefit will be if it has a similar MTOW as its MLW then you will be able to do quick hop and pops and carry plenty of gas with you.
Looking at the numbers though 5900 lbs should be plenty of gas for Perth return. As a guess I would say 1800 lbs out and 1800 lbs in. It will be just a question of how much equipment and stuff you can take.