My idea would be to make a Mod that follows hair regrowth at the same time as the beard.
In the game I did not notice a hair regrowth, which would force us to go to a hairdresser and then triggered a hidden quest.
There is also, make a transition from clean hair to dirty, to do a quest is triggered by Mod with game time ID.
By this quest Edit the character for the Christmas occasion and a specific place of the game.
I thought of Kermoren, Ciri, Yen etc...Zotan for the Leprechaun.