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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.
@azrobbo
There are adapter boards from Bellin Dynamic Systems and Schmartboard for .4mm pitch.
The Bellin B508 module includes two .4mm to .100" breakout modules. http://www.beldynsys.com/p508.htm
The adapters for .4mm pitch are on the back. They're designed to snap apart, into modules as pictured below, then you can cut them even smaller if needed:
note: the sample photo is for a different pitch.
The SchmartBoard Module is the 202-0047-01 http://www.schmartboard.com/index.asp?page=products_connectors&id=319
I'm not sure which would work best for your project. But, it seems like either would be quicker than spinning your own PCB.