Australia has had FIS for IFR for a very long time. There is no requirement that limits an instrument approach to a controlled field. In fact the vast majority of IAP aerodromes are non-controlled. Not even an AFIS. You have to talk to the other aircraft to organise who's going to do what and learn to keep a mental map of who might affect you.
Unlike the UK, to fly IFR you must submit a flight plan so none of this 'Now I'm VFR ... now I'm IFR .... now I'm VFR ... now I'm IFR' that can be done in the UK's Class G without notifying ATS.