If you’re gonna send a bunch of shit out into the far Pacific, ATM the Empire is far better off trying to reach, conquer, centralize the Hawaiian Islands. Why?
-Strategic control over the Central and Eastern Pacific. Claiming Maui, Kahoolawe, and Molokini, somewhat strangely, allows the Empire to rapidly reinforce Tahiti and other nearby islands due to convenient ocean currents.
-OTL Johnston Atoll is so fucking remote and obscure the Empire can and should use it as a staging ground for shadier uses of soft power and, (MUCH) later on, weapons testing.
-The Islands are small and each have several good natural harbors: Lamalapau in Lanai, Maalaea and Kahului in Maui, Pearl Harbor and Ewa in Oahu, and I’m sure I’m missing some from the other places. Imperial garrisons will be more concentrated and can mostly be comprised of naval personnel.
-Rich volcanic soils, but I’m sure NZ has those too.
-Stopping point between the Americas and Asia. I strongly suspect that the same demographic trends from OTL will be differently emphasized ITTL in Hawaii: prepare to see Japanese, Filipino, Samoan, and other immigrants to the Islands come in similar numbers—except this time they’re not laborers, they’re soldiers, sailors, merchants, and ranchers—and united under the same political banner of Rome.
I could go on, but eh