Feature Request: Keybind to toggle window opacity (desktop wide & focused app)

[Tizz-Tumbler]

// all rules applied over top of current transparency settings
$mainMod+Shift, M, exec, apply/toggle that gives all windows 100% opacity
$mainMod, m, exec, apply/toggle current windows opacity between 100% and current value

Would like a way without:

• having to manually edit window rules each toggle
• being confined to using fullscreen view to get 100% opacity

on the dl if someone knows how to f w keybinds to make this happen, it doesn't have to be a permanent feature