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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
You know you can also share the SPI pins? So you just re-use the same MOSI, MOSI and SCLK for all your parts, and then give them separate CS pins?
Also with I2C you can just share the same 2 wires for everything, as long as you have different devices (so they have different addresses). It might even be that you can do what you need without a port expander?