You said that Submarmines need to be in the pen for protection. That means they are shielded from destroyer + air attacks?
Blind A/A
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Has anyone ever played blind AA? It’s basically playing with two boardgames, one for Axis and one for Allies, with a moderator. The point is to give a fog of war effect to the gameplay where only adjacent lands are shown. I played it wonce about 8 years ago and had a blast. It took a little longer but was way more fun and challenging. The moderator has to be very knowledgeable and fair.
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that seems a little complicated though. Besides, getting a fair moderater might prove to be a challange.