I only found this while trying to do a google search for how to make one of these myself, care to share that knowledge? I'll settle for one of your edits until then.
Edit: lol, never mind, these don't even work in SE
Here's what it looks like when I simply place the texture in the corresponding folder for literally any wallpaper replacement mod: https://i.imgur.com/raMmDAu.jpg
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Edit: lol, never mind, these don't even work in SE
https://i.imgur.com/f8uIFxI.jpg
So for whatever reason, it seems Bethesda just hates anyone with a 21:9 monitor.