This P8 watch idea looks great. I was looking at Pebble watches, but I'm not sure that the guy in Spain selling them on eBay would send them down here to NZ.
I noticed Pinetime watches online, and thought that they would be ideal for EUC wheel development. Just needs someone cleverer than me to write the KingSong (and others) code.
Now I see that you've already been considering this as an option. Maybe an entrepreneur type EUC wheeler could buy the watches, programme them, and on-sell them complete to end users.
A question - when you buy the P8 watches they come with a built-in fitness app. After they've been flashed is there any way to recover the original app? Maybe the DaFit
Flasher has a backup option.