Yes CSE will allow you to use an ESP as a master.
The reason I asked about factions is because of a "solution" I came up with for the bandits that attack the Gates of Madness in the Shivering Isles after you've completed the SI main quest. The are all just standard melee bandits but if you try to talk to one (after I've done my usual "befriending" thing) they will have the "I have no greeting" problem. It was solved in my case by using the console to assign them to the SEWildernessFaction (console formID 42db5).
You could do a test yourself. Use the console to assign your vampire NPC to the Oblivion Vampire Faction (formID 33f53 ... rank 0 should do for a test). The console command will be:
setfactionrank 33f53 0
done while the NPC's refID is displayed at the top of the screen. If they now have dialogue you can use the CS to assign the NPC to that faction (the console command won't "stick" until after you've saved).
- Edit - If the vampire NPC has dialogue after giving them the faction but is now hostile to the player you can solve that by just setting their aggresion to less than 5 in the CS (found on the Packages menu).
- Edit 2 - Also doesn't have to be the vampire faction ... you could pick a faction that is friendly to the player. Just be aware that some factions are used by the game to control which dialogue topics are available to an NPC (e.g. the Bravil faction doesn't have the dialogue "The prettiest town in Cyrodiil ... don't know but the ugliest is Bravil" but other town factions do have that dialogue available).
Edited by Striker879, 18 February 2020 - 12:34 AM.