See below - I could add more skins if someone draws those, but it’s a fair bit of work.
Not easily¹, but I’m open to the idea of adding a command if someone actually goes through and draws the whole set, because it’s been 10 years of people asking about this and then nothing happening afterwards.
¹ You could probably use undertalemodtool or yytextureview to replace an existing skin but it’s a little more work.