I give you experimental link. Also included C# project that draw cached image into desktop.
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Added Method_1 and...

I think first method are better. But need always refresh background after restart your PC. In Windows 10 have bug with Hero wallpaper. But first method have less glitches. I'm not found method for...

StartIsBack is my best choose! No other start menus can't be replace StartIsBack. This is real Windows 7 start menu. And have much tweaks. I'm purchased licenses.

Startisback good choose.
StartIsBack: real start menu for Windows 8 and Windows 10

Bonus! Add to startup this script.
Before using this script, apply one of two wallpaper through state tool, then replace cached images.
I'm tried remove or replace transcoded but gets glitches....

Per-orientation wallpaper (look take 2)
Wallpaper trick (screen orientation) - Windows 10 Forums
No needed utils.

I added new method for change per-resolution wallpapers. But new method are temporary, but not required changes system wallpapers.

Take 2 - hardcore method.

Means need change cached image. Main feature - no need change system images.
1. Go to to deeeeeeeeeeeeeeeeeeeeeep folder.
...

I suggest to tweak add possibility change per orientation wallpapers.
I gived trick in another theme.

But I warn, that need backup default wallpapers.
Wallpaper trick (screen orientation) -...

Hello. I give trick how to use different wallpapers in different display orientation. And give some info for future. Do it at your own risk!

Experimental:
Wallpaper trick (screen orientation) -...