I guess you might be able to make a small PCB that sits on top of Puck.js and contains the accelerometer? At least the silicone is pliable enough that you could get an extra 2mm or so in there without too much trouble.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
I guess you might be able to make a small PCB that sits on top of Puck.js and contains the accelerometer? At least the silicone is pliable enough that you could get an extra 2mm or so in there without too much trouble.