Get an IFR rating! Even though you will most likely be flying VFR Top End conditions can be challenging. Special VFR (is that even still around?), dry season smoke haze, etc. Not only that it means you don’t have to take time off to do it in the future and you are ready.
You may get lucky and have an IFR single that means you can keep current or do some night on returns? Not sure on that one!
Essentially up skills with valid legitimate courses that give you a license or a rating are always worth it.