You will need to get your blue plate from an engineer, roadworthy places very often do not have the ability to do these. Your NSW engineers unfortunately don't mean much in Qld, but it can't hurt to take it along, as the Qld engineer has to be happy with the conversion. I assume that engine and box ( and possibly brakes?) will need to be done. (LA1, LB1, LD1).
I think you'll find that a friendly roadworthy may be hard to get as your car will have to go to Queensland Transport, and I know they're on the war path atm. Good Luck!