The Battlecruiser, built as a hunter-killer, is dramatically less useful if we’re talking about the original map, on which even Cruisers have limited utility due to the relatively short distances between continents. I’m also not sure the Commerce Raider/Auxiliary Cruiser is viable on such a board. Certainly the Torpedo Boat Destroyer and the Torpedo Bomber are not.
Possibly the Armored Carrier might have value, if somebody really wants to operate such a platform either independently, or integrated with a small(er) squadron.
Honestly, I don’t think that even the G1940 map from HBG is large enough to justify adding new units.
By the time we get to talking about a map with oceans that may take two or even three turns to cross, we run into the question of whether land and air combat are even working on the same timescale – they are not, really. However, I do want to see navigable rivers (Mississippi and Yangtze) and larger oceans, along with more “metropolitan” territories (e.g., National Capital Region) on future maps.