I'd leave them on for sure, Let the RTA deal with it.
bloddy useless bunch, Everytime i call a government body, Actaully anyone, I call 3 times minimum with the same question, You will find 90% of the time you get 3 diffrent answers and procedures to complete something.
Call the RTA and tell them how you go about rego/ blue slip for a car thats had rego laspe and a engine conversion in the meantime.
Now thats what i call confussing, especailly when they transfer you to the " tenchincal team" who i was told deal with engine conversions ect every day.
They just read out a list of RTA approved mechanics
sorry, RMS.......still a useless bunch