maybe an item that could turn a regular dye kit into hair dye for all the standard HA hairstyles using the 3-chambered measuring device?
Kind of like how you can dye clothing items and squishies, but being able to dye your hair.
For example:
My hair style right now is like the dark blonde rugged hair. If I bought an azure dye kit and turned it into like, a bottle of human hair dye or something, then clicked "use item", I would permanently have the "rugged hair" in azure as an option in the body features, even if i decided to switch my hairstyle.