If they attempted to tie all Pacific Island cultures into one place, I agree. It’s a similar argument to smashing Coco and Encanto into one land without delineation of locale. Yet, AK pulls off “Asia” and “Africa,” both vast and diverse, relatively successfully. Granted, Rhode May not be there to get a similar effect this time around, but one possibility:
Have Sydney Harbor “host” the land anchored by Nemo theater refaced to the Opera House. Then, a Polynesian Visitor Center of sorts set in Australia can tell the cultural and animal story with Moana and Maui joining in some fashion. A well executed flume could recreate their journey across the ocean, both restoring the heart of Te Fiti edutainment style and landing them in Sydney for their upcoming vacation/visit.
I’m not a creative by any means, so don’t ask me for exact details. But I can see it working in my logical head.