Mainframe takes my point to it's logical conclusion.
I believe our old friend Pb0x90 was part of a team that took the FARS and the NZ stuff Part by Part examined each one took the most suitable and produced a perfectly satisfactory Aussie suite. Gordian knot solution it may have been at the time but probably too simple for the then post colonial mindset. So it's not a new idea.
We did have an NZ DCA/CAA/DOTARS (strike out unnecessary acrimon) boss and my memory is becoming increasingly scratchy with age but the power that was at the time must have had his ally foil hat on at the time and he was pushed out.
Maybe the time has come for Mainframe. Mind you there are SOME warts on the FAA system, but at least they haven't been dicked around forever.