Yes actually I made a valkyrie recently in fact for the dakka painting challenge.
https://www.dakkadakka.com/gallery/1085912-Valkyrie.html
So having had some experience with this concept, be ready to sand and sculpt where needed. I suggest 3d printed wings because you can get them in any size.
I used the wings from "sol the Holiest archangel" model. You can buy just the wings from an etsy shop. I can dig up a link if you need it.
Sanguine wings are awful
imo and there's no fixing them. Just get a good set for a buck or two online.