Lead, I apologise for defaming your good name by referring to you as ex-CASA, ie., here to help or otherwise.
Victa left, when, in the 70's ? Why ?
Did Gippsland Aviation run out of money ? Why ?
So, get FAA and EASA.
As for CS and QF, is CASA the lead agency in aviation trade policy as a subset of Australia's foreign policy ? Nope, they get the memo or if they're lucky they get the script to read at the appropriate time. Agreements at the CS and QF level and maybe even at the GA aircraft export level if competing against a friendly US or EU trade partner, happen between governments as a part of trade deals within the foreign policy context, ie DFAT and PMC, and both regard CASA as an equivalent of the Dept of Health's chain of venereal disease clinics.
Other than that, Government in general has no interest in GA and is more than happy to leave CASA to it's playpen, pulling the wings off flies, etc.
In matters of manufacturing and export generally, see
https://en.wikipedia.org/wiki/United...t_Organization Look carefully at the reference to the 1975 Lima Agreement and don't take the conspiracy stuff to heart.