NickAfter some research & thinking, I've settled on using ePaper as display as updates are unlikely to be required more than once per second and frequently not for minutes or even hours at a time, alongside an ESP8266 module from Adafruit that will take care of battery charging and can be put in to deep sleep mode, which should enable a very small LiPo battery to be used, despite using WiFi to communicate with the world.
The total weight of these three components should come in well under 25g which compares well with my Timex outdoor watch at 33g.
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When I say 'settled' on using those items, that's for the prototype / minimum viable product - inevitably using off the shelf boards ends up with some compromises, but a quick start is a wonderful thing.
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