This is a great idea. I'll need to get learn Chinese for it to be any use to me: At the moment I can only manage numbers, and my girlfriend's name.
I was absentmindedly fondling my old-school Swatch watch while reading Chinese when it struck me: A touch-sensitive watch face is an ideal size and shape for inputting Chinese logograms — better even than a smartphone, because you can do it continuously, and inconspicuously. Just frame the watch face with you thumb and middle finger, then “sign” with your index finger.
That’s enough to let another Apple Watch wearer read your full-fledged Chinese texts in real time. You’re not even dependent on OCR software to transcribe your scribbles into machine-readable text — the only recognition ability needed is that of another human.