TIL that when you use the venerable keyboard customizer Karabiner Elements on macOS, Karabiner will emit a USB device key signal for the fn/🌐 key. This is great because I can now tell Keyboard Maestro (and likely BetterTouchTool, too) to use a fn press as a macro trigger!
For example, this is how it looks when I configured ⌘fn as such a trigger:
Useful!
