I know its too late to change the DLC.
I know you had good intentions. As you state on the website the 3 Kingdoms are the start of Chinas medieval times as are the romans for europe. With that I can see why you added them, even though I am not happy with it.
BUT: lets face it. there is no medieval China content in the campaigns as of now. So while I understand we have to live with this DLC now, lets fix it with the next DLC:
Add Tibetans, Dali and split Kithans with Tanguts
Add Campaigns for China, Korea, Japan, Kithans, Tanguts, Jurchens and Tibetans. there are interesting options if you look at the history maps.