Share This Page?

That's sounds like the best option,
make a shortcut for share in Edge browser and also make that shortcut universal in Windows OS. I'm reading these websites:
http://blog.drivethelife.com/windows-10/windows-shortcut-keys-use-windows-10.html
https://www.windowscentral.com/best-windows-10-keyboard-shortcuts

and they mention that Win key + H opens the share charm.
the articles 3 years old of course and the share charm menu is removed, but it would be great if MS implement the same thing again.
so for example Win + H (or any other combination) can be the universal share shortcut.
using it in Edge insider, in photo viewer, in paint3D, in office programs etc will launch the small share window which is the same in every program.