Adafruit Trinket based USB keyboard emulator for button with covered toggle switch for arming.
This project came about because one of the CloudFlare London support staff mentioned in the office they've "always wanted one of those missile command switches with the cover". I'd been meaning to try out the Adafruit Trinket in a project; this was the perfect excuse.
When armed the push button becomes live. Pressing it causes a short countdown to begin during which the buttons flash (and switching off the toggle switch stops the count). Once the countdown expires the keyboard emulation sends Alt-L followed by the URL of the CloudFlare internal support web site.
Note: this project does not use the Adafruit Trinket USB library because of difficulty I had getting it working with the Mac. I substituted the Digispark Keyboard library which worked well. Further details of this can be found in this thread.