It has been done.
Not my first c6 5* sadly (f you Diluc for stealing that) but at least he's still my first limited c6 5*. He will very likely remain the only one for a long time (Shenhe feels tempting sometimes but... nah), the amount of wishes I needed was ridiculous. Still with how much I enjoy him it's absolutely worth it for me and welkin has been helping quite a bit.