Made some enquiries for you guys in WA through a dealer on the east coast. It was as I expected, there are some pretty strict "no poaching" rules in place for interstate dealers. At best they might be able to slip you a demo/ floor-stock if it was done on the quiet, but even then they're reluctant to risk the wrath of head office.
In their words "I understand the dealer in WA has the market pretty much sewn-up over there" which, reading between the lines, says to me you guys in WA aren't going to see anything different anytime soon unfortunately.
I guess the question is - for $x, is it worth mucking around to buy and register a car in Vic/ NSW/ Qld and ship it over?