I don’t think there will be a problem in unit recognition if this is done properly. Take rise of nations for an example:
https://forums.ageofempires.com/t/regional-skins-are-already-in-the-game-its-just-a-matter-of-allowing-through-non-data-mod-for-asian-african-civs/85404/34?u=juggernaut8704

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