Yes, I have.
2 pilot IR is a waste of time. You may as well not have one, employment wise.
Get your single pilot IR done. Saves an Aussie flight test and all the **** that goes with that.
Convert all that to an Aussie licence in one hit.
Not sure about the 1 shot thing. I converted a NZ CPL years ago. Never used it. Then I converted a NZ ATPL over. No big deal, just paperwork and money.