Update:
I found a new way to do this without all of this removing stuff you said in your post.
I found it on Reddit, (link to the post:
https://www.reddit.com/r/Steam/comme...me_drive_2021/)
Basically you need a pendrive, then you create a steam library there, you cut and past it onto the C drive, then edit few steam .vdf files and you are done.
I will post an tutorial for others soon to make this more straight.