Have you ever thought of having any of the Chinese dynasties as civs like the Song, Qing, Ming, or Han? The city naming could be complicated, but overall I think it would be nice to have a more in depth China
Logically, in doing that, there would be demands for a greater diversity of other nations that were several states rather than just one.
Namely, the Celts would probably be demanded to be divided to Arverni (for Vercingetorix), Senones (for Brennus), Iceni (for Boudicca). The Greeks would likely be demanded to be divided among Athens, Sparta, Corinth, Thebes, Argos, and already there are custom civs for Macedon, Baktria, Minos, Troy, and Mycenae, and the Native Americans have already been divided among Sioux, Iroquois, etcetera.
So I'd say, this idea would probably be a good one for diversity, but it should definitely NOT be like the case with Kemet/Egypt, but ssomething that should allow for people to pick and choose which they want to add in themselves.