I would play more Naval if this would be combined with Air and Ground.
Give Bismarck. And CAS seems a bit too difficult to do there.
Ground and naval don’t really make sense to combine, but they could try a few things.
Could make for a good D-day scenario.
Maybe it could be a start to use patrol boats and caps on the water and rivers on ground battle maps
I mean you’d just have boats obliterating anything that comes near the beach areas.
I think if you want all 3 you’d need to use a map like Pacific Hidden Base with ground forces playing in the middle, naval around it and air would spawn from an aircraft carrier, then ships and air would be fighting to destroy and defend their aircraft carrier to maintain the ability for an air spawn, coastal could be closer to the middle fighting their own battles.
Map full of mountain and cliffs adds a lot more strategy to air and helicopters at later BRs, also protects ground forces on top of air being busy with naval and air, instead of just targeting ground.
You could always do Guadalcanal with all 3. The Americans running supplies to Henderson field while the Japanese try to stop them and retake the airfield.