This is what we do in game. Each neutral has a territory value and some kind of army and a few ships. You can attack them if you want. But u need to capture each neutral territory to get icp income.
If you lose battle then just that lone neutral joins other side.
But we also have a cost to try and influence a strict neutral to your side and you receive the territory value towards income and what is there for the ground troops and a possible ship. Nothing stronger than a Destroyer.
Not all countries can influence the same neutrals. We roll a d20 and a 4 or less u get neutral.
This is just an idea u may look at.
Spain and Turkey have the biggest Amy but cost more for those 2 to try and get.
Guadalcanal - 1st player rule
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As with another AH game of the past (Mustangs) - make it part of the game that a player can pass the 1st player token at any time to their opponent. However, the US player can reject the pass with a dice roll of 6. This simulates the US breaking of the IJN code. Once broken the IJN must keep the 1st player token for the remainder of the turn. Rule phase 3, step 6; Pass the token, is not used.