This is a personal compatibility patch that I made a good while ago which covers the following mods that would otherwise conflict: "Monster Facial Animation", "Enable 1st Person For Werewolf and Vampire Lord" and "Growl - Werebeasts of Skyrim", where I've merged the race records and armor addons from said mods. For instance, werebeasts will have the keyword "HRI_Lycan_Keyword_IsWerecreature" as well as attack spells from Growl, while also having the head parts with facial movements from MFA.
And unless you've figured it out, this fix also covers werebears and vampire lords.


Recommended mods
Combat Gameplay Overhaul (Enhances your attack movement/speed in first person)
Everlasting Werewolf (Since Growl lets you change back at will by holding down the shout button)


Installation
Install the required mods in the following order: MFA, 1stp mod and Growl, either manually or through Vortex/NMM.
Then you install my patch and click yes to overwrite.
Should you want to install manually, extract the Data folder in the archive to your Skyrim directory
(C:\Program Files (x86)\Steam\steamapps\common\Skyrim Special Edition)
And in Wrye Bash you make sure the plugins are loaded like in my screenshot.


Troubleshooting
-"I can't seem to ready my claws while in first person"
This issue is most likely present in the 1st person mod alone, try to sheathe your claws in third person, enter first person view and then ready your claws.

-"Is it compatible with Sacrosanct?"
According to my research, that one doesn't alter the Vampire Lord race or it's armor addon unlike my patch or it's required mods, it does however modify the player Vampire Lord script. You can download the patched script from the optional files of the 1st person mod.