So after reading the previous posters view, it very plain that IFR traffice get sweet all extra service, but the real possibility of taking out a VFR aircraft exercising his freedom to fly.
So why put it in place. Why not put a 30 nm Class D zone at Broome and Karratha, sfc to 10,000. That will give the controller time to sequence inbound traffic, we will enter on descent at 30nm, about 5 mins out.
We can look after ourselves, (as we have been doing for decades) in G airspace from FL180 to 10000. This is a workable proposition, normally their is no VFR aircraft above A100, except the odd survey flight.
That means there is no additional industry charges for the implementation of another sector.