Voila! You sir are a star!
Works like a champ, I just dumped the latest appropriate binary from the Espruino repo onto an Nordic DK-52 and then used the Windows 10 binary IDE to upload the code you suggested in your kind response.
Now I need to think about what I2C peripherals would make sense to evaluate...
Ps. Your software solution was in conclusion, hand's down the easiest! I tried quite a list of technologies.