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You can create create and modify units, you can use jorodox tools for chrome to export and import models if they are in a .mesh format. If you modify them will you have to make new animations because when importing them with jorodox the armature coordinates or something get messed up and won't work with the orignal animations.
also I have no idea how to get attachments and such working for HOI4, not sure if they sort've work the same as ck2 or not.