What about if the community make a new expansion;

With Japanase Mythology, the japanese mythology is so huge, as example:
Izanagi
Izanami
Amaterasu (as a major Goddess), AND AS A TITAN...!
Susanoo (as a major God), and as a Heroe
And as king in the japanese civilization you could create a Emperor in the Chrysantemum Throne (as the egyptians, when one pharaoh dies, he is succeded by another)
As heroe you could create a samurai, Shogun, Daimyo... etc...
The japanese civilization has many mythical creatures, as Seryu (the dragon with 3 claws)
Nekomatsu... Kitsune...

The only thing you could change are the units in AOM Tale of dragon, doubt the chinese buildings are so seemed to japanese... campaigns... etc...