I'd like to work in Micronesia... Vanuatu, New Caledonia, Fiji, Samoa... etc. Jobs there are very hard to get for outsiders and I think the Aussies and New Zealanders have the market. Anything ratings wise would only help.
How about Guam ? Pacific Island Aviation is a Northwest Airlink with 3 Shorts 360s. That is what their website says anyway. I remember them always advertising for pilots when they had the Bandits, not sure about now. They serve Guam, Rota, Tinian, and Saipan.
Further down the road, about 750 nm, is The Republic of Palau. I ran into the ex-Cathay pilot who owns the air service down there a few years back. They have singles and a light twin for charter service around the islands. Being a former U.S. territory I believe they still use FAA standard for certification.
The Federated States of Micronesia themselves comprise the island groups of Yap, Chuuk ( Truk ), Pohnpei, and Kosrae. The only regularly scheduled service to them is with Continental Micronesia. I would bet there are some charter outfits there though.
You are right about the South Pacific being dominated by the Kiwis and Aussies. In the Cooks, Air Rarotonga had 3 Bandeirantes when I was there in 1995. The pilots were mostly Kiwis as the island group has a close association with New Zealand.
For work in the South Pacific I would agree that an Australian or New Zealand certificate would probably be better. For work in the area of Guam, Micronesia, or Palau then a U.S. Certificate might just be all you need.
Typhoonpilot