Thank you Comfy Chair!!
After some more research, a colleague of mine gave me a reference I've been looking for CONFIRMING that the Z is indeed the preferred approach!!
It states:
"If a state identifies two or more approach procedures which are based on the same NAVAID, they are shown with a figure or a letter suffixed as, e.g. ”A”, ”B” but ”One”, ”Two”. Where approach procedure designator suffixes are officially published with "A" or "B", "One" or "Two" respectively ”Z”, ”Y” or ”X”, the primary procedure (usually the standard procedure with the lowest minima) will be identified with the suffix "Z.
So…. now the only question I have is again…. in absence of a procedure to fly, which one would you legally be required to fly? I still say it is wise and prudent to ask for clarification. How can you not… especially as the controllers down under can be a bit demanding…. good, but a bit demanding.
Kap