Pretty picture, peuce!
Just a little addendum to your thoughts - re the Broome procedures doc statement;
"Maintain communication with ATC (All traffic is known)"
Is there anyone out there with more info (and the liberty to share said gumph) in relation to which airspace that statement actually refers to, and what procedures are to be followed (ie it certainly ain`t smelling like the generic E "monitor and self-announce") -
Tower only up to A045?
Sectors up to, say, transition altitude or maybe F180 (ie base of existing E)?
The statement is a tad "open", would be nice for everyone to be on the same page - any more-informed oracles out there than we the great unwashed?