You don't necessarily need across-the-ocean bandwidth to facilitate NZ file sharing. Just adapt the "college dorm has a massive fileserver with pirated movies, so that movies only need to be downloaded from the internet at large once" model.

I blow part of my monthly 'real across-the-ocean internet' limit downloading Night of the Living Dead from archive.org, then provide access to it for other New Zealanders using the hypothetical local mesh network.