I normally don't put more than one board design in the pipeline at a time, but I'm really confident with this one, so I decided to make a version as a badge. Yes, I know DEFCON just ended, but hey.

The new variant is a 3.5" circle. It has some holes potentially for mounting in a case, but it also has a badge clip hole at the top (from previous experience and thanks to @Benchoff the spec for that is a 1/4" hole centered 1/4" in from an edge). There's a double-AA holder on the back and the four buttons are on a centered square on the front with the 4 LEDs on a larger centered square. As a badge, some means of mounting the speaker would need to be worked out, but there are lots of potential solutions to that problem.