Why did this need to be an “app” that lives in your tray? You can whip this up in most scripting languages in an hour max, and if you can’t easily set a keybinding for it with what you’re using then you can set up AHK to run it.

Hell, the whole thing could be done in AHK completely with dynamically setting your “safe” window with a different key combo.

Capture the current focused window’s PID with one keybinding, or the window title, or some other unique identifier of your choice.

Another keybinding mutes, switches to desktop, then maximizes previously saved window. If previously saved window does not exist, does some sort of backup action, like opening a reasonable Google search.