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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.
@Gordon
I guess you're stuck as you have already made your board, however you could use optoisolators.
Because the optoisolator's input is basically a LED you could connect all the anodes to the SPI output, with all the cathodes to GPIOs. You could then control which optoisolator output was active by fiddling with the GPIOs.