Based on Raspberry Pi Zero 2 W, the Bee Write Back writerdeck is another DIY project that should be relatively easy to ...
The Artemis Watch 2.0, made by CircuitMess, is a $129 programmable smartwatch designed less as a gadget you wear and more as something you can digitally rebuild into your own creation.
The Pi Picos are tiny but capable, once you get used to their differences.