Is it possible to add possessor categories via console?

[matador77]

I like playing around with different characters with categories from a range of classes, either as an adventurer or by using the console to add a category to
an existing class if it seems like it could open up new possibilities. For other classes its easy to add their categories via the console as described in https://te4.org/wiki/Debugging. However for some reason I cant get it to work for possessor classes. Is there some kind of code stopping them form being added, or do they have weird spelling or capitalization in the lua? I'd appreciate any help, as I'm trying to add the Psionic Menace and Ravenous Mind categories to the doomed class to play around with it, but I cant seem to get it to work. Thank you.