That mod doesn't have any plugins that I can load to patch (esp or esl). They're texture/mesh based (loose files). Overwriting is the only way to go about that from what I can tell.
I can't tell what's causing it, but could you make something similar for just vampires? I've been putting off Dawnguard until I find a viable way to fix it
Do you have a mod that is overhauling the appearances of all vampires? AI mods are usually tied with the facial textures of npcs for reasons I forgot, there was a reddit post about why it causes these bugs. But if you have an npc overhaul that modifies the face like Bijin, Pandorable NPCs, etc. that will have to be patched.
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A little question: I checked the patch in SSEdit and i saw this in Many NPC:
I am not to be sure about this, but isn't will it be some problems with that? Face Discoloration or something like that.
it's possible make a patch for this mod https://www.nexusmods.com/skyrimspecialedition/mods/77700