I could imagine something like Colonialism:TW.

European powers in a competition to conquer the world against Chinese, Indian, Africa... Leading to a clash of interest spheres and finally to war between the superpowers in Europe itself.

Napoleon would make a good add-on to that, in Alexander style.

This would include a much larger strategy map and very different goals and scenarios depending on the faction you play. English against French in America, Ottomans against Germany/Austria/Russia, British against Portuguese in Asia and lots more.

A 20th century or fantasy game wouldn't be TW anymore.