honestly. a lot of animals currently dropp "rare" curios. and many of those dont even have a use case. as they are to unreliable to farm. or just so bad that you never use them.
the one use case they often have is as a funny animation on a wall. or in a display case.
just make caverat wiskers equippable in face slot. or the serpents tounge in the mouth slot. put +2 will +2 charisma on and done. its funny. it looks cute, and allows you to fill slots that stay empty or have just 1 equippable item for a long time untill midgame.