It does seem confusing to me that the Phoenix and Auckland could enter. Seems they are getting the best out of two federations (Asia and Oceania).
We are just at the early EOI stage. It might after further discussions between FIFA, AFC and OFC that they can't.
But if bringing in NZ's 2 well resourced ALM clubs (well their Reserve teams) gives the new OFC pro league a better chance of succeeding, then yeah I can see FIFA making some sort of exemptions. Infantino wants OFC's 10 votes at the next FIFA elections. He wants this league to happen, and last for the long term..
I can see NZF being keen on teams in Auckland and Christchurch. Pragnell wants pro football in NZ to have a national footprint, and if a 3rd A League club can't yet be launched in the Sth Island, this new OFC League is a useful cheaper option.
Maybe the Nix and ChCh United could do some sort of partnership arrangement. Some Weenix players going down to ChCh for 6 mths. The OFC league team a pathway to the Nix ALM squad. Something like that. Probably unlikely. But the Melbourne Storm NRL club, have their reserve players playing for feeder club Sunshine Coast Falcons in the Queensland Cup league comp. A 2 hour plane ride. So not complete madness.