Well, that makes this whole exercise pointless then.
Bets on which team will deny those players game time?
Theoretically every single team could say no to the extra players, and this whole thing would be pointless. You'd think this is the sort of thing that would be worked out before the season starts and NZF would just make the ruling rather than leaving it up to clubs (who wouldn't want to disadvantage themselves - at least until they're mathematically out of it) week to week.