A Flight Instructors Rating would also be a very valuable rating to have and it certainly should get you an instructing job pretty much anywhere even with a fresh Grade 3 provided that you have the right attitude.
With CASA now driving the requirement for all Check and Trainers in CAR 217 organisations to have instructor ratings, the only way to get into this is to have a FIR. Knowing what I know now, I wish I had done my FIR before heading North 25 years ago.
Don't leave home without all the ATPL subjects passed and an FIR would be my suggestion for anyone heading North, IR can be done anytime quite easily when required.