Meh, I found an issue I can't fix.
The mod simply works like this: I took the files with the new hairstyles and renamed them all to the default one. It works during gameplay and most cutscenes, but in some, like the very first one in the forest and the one when Geralt's dressing up in the tent, the game seems to be using another file located elsewhere. I found that file and replaced it with one of the hairstyle files just like I did with the default in-game one, and it just doesn't work. Geralt still has his ponytail during those cutscenes. Any idea what I am doing wrong? The file and folder names are correct.
During those squences it could be loading a different charater model as with the possession sequences. So while you may be editing one character models hair the other remains untouched.