I found a classic M-Series keyboard and I want to use it. However, it does not have a Windows key (AKA Super key); only Shift, Ctrl and Alt. My keyboard shortcuts are cluttered as-is, since I try to control both Emacs and the Windows manager (Gnome) entirely from the keyboard. I rely on the Super key to identify Windows manager shortcuts.
How can I perform keyboard-centric work without the Super key?