A cosmetic/data DLC I'd pay for

First change the Slavs to the Rus, change the name of the winged Hussars because Hussars also have wings (someone’s earlier post made me feel strange about it now), add unique castles because it’s weird that certain civilizations have them but not all, make the Huns/Goths share architecture not so middle age like? and use the sprites from scenario editor to create regional units. I was trying to figure how to mod it to the way I wanted it but not sure how hard or easy it is.