I agree windage is a major issue.
Philosophically I can see a problem with a drop keel on a modern ship model, even though it may provide a practical solution. This would also be a barrier to a manufacturer.
However, there is a similar issue with sailing boats. If the prototype did not sail well then, with the problems of scale, a model will also not sail well. As a result there are no plans or kits for working models of some very famous ships and/or types of ship. Examples, Viking long boats, Xebecs, Roman galleys,and tea clippers; Santa Maria, Nina and Pinta.
There are also those with rigs that do not lend themselves to RC, like sailing dhows, and boats with lug or lateen sails.
There are static model kits/plans, and models by fanatic modelers, but not working model kits, sadly.