Turn existing Sim in create-a-sim into a werewolf

It's kind of annoying that you have to create a sim from scratch in order to create a werewolf or other occult.
I found a pretty good version of Remus Lupin on the gallary and I needed him to be a werewolf.


I cheated the relationship and had a werewolf turn him, which breaks story lore of how he really became a werewolf.


I wish I could just assign him to being a werewolf in CAS.