idk if you sloved the hair issue, but maybe a world space billboard (with post processing?). It might solve the problem since you want it to just be a plane/ flat surface.
It is a difficulty. Can you not just set it up so that her hair is a decal in front of her model that stays flat and towards the screen, regardless of how she turns? I know nothing of modeling and programming, so I would not know.
Bro yo te diria que si primero vas a hacer el capitulo de homero cuando lo termines pone para que la gente lo juegue y podes poner el easter egg de la cara de una baca afuera del mapa porfa