Have you seen Spicetify[0]? It allows for this kind of stuff and seems to be a lot more stable than doing it all manually.

[0] https://spicetify.app/

I have, it's good, but it is not compatible with some of the things I am doing which are quite a bit more foundational/stuctural. The pile of scripts I've accumulated do a pretty good job of resolving easy breakages, listing anything worse, and running a little lap around all of my typical interactions (from another account running in a cloud vm) to diff the network requests so I look normal to them.