Alright I took a stab at making a LoRA for miori celesta. Result is.... not amazing. It's usable, and you can use it to prompt both her original & casual outfits, but there's some gacha involved. Also the treble clef hair ornament is just a squiggle, so you'll have to inpaint if you really want that.
I'll probably update this one, try to nail down the treble clef & do the outfits as separate LoRA.
https://mega.nz/folder/IfhWWJoC#kI-DbIIs7N960N345Gb1Nw