Which 5? Because I’ve just posted my first non-Han Chinese civ preliminary in my thread on a series of China-Region DLCs, and it’s Dali… well, if age-coupled name switches are allowed, Nanman/Cuanman/Nanzhao/Dali obviously, with trigger-relabels for campaign use.
It’ll be interesting to see how you envision your civs, as I’ll almost certainly have them all by the time I’m done working through my list.
Thread here: (though DLC layout is a bit outdated already after I had to split Western and Eastern Han):