Well this was a thrilling discussion.
Apart from the "city sharing" suggestions, I like it.
Perth, NZ2 and Adelaide.
Competition split into 4 divisions of 5. Play everyone in division twice (8 matches) and everyone else once (15 games), making 23 rounds in total. Work out the finals later.
Each team gets 11 home games, and 11 away games, with magic round being considered as a neutral venue.
As for the Pacific, I'm of the view that the ARLC should assist in supporting and growing local domestic competitions. Clubs from PNG, Samoa, Fiji, Tonga, Cook Islands, etc etc, should be looking at their own club competition/club championship. An NRL team, particularly based in Australia, representing numerous countries, is not going to assist anyone.
Imagine if the NFL wanted to add a "Europe" team to the NFL based in Berlin and London, and expecting people from France to follow it. Ridiculous.