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Does this mean that a clever enough person could port Espruino (and the Bangle firmware/software) to the Pine-watch?
Yes, definitely. without any significant work you can build generic Espruino firmware that will run in any nrf52832 device including pinetime. With no support for specific hardware you'll only get BLE uart console and device will be conectable over bluetooth e.g. via https://www.espruino.com/ide/ and you can run javascript code inside. Also power management will work sensibly - i.e device will last weeks with bluetooth on.
Then if you want to use the hardware - display, buttons, accelerometer, HR sensor, .... you can access it directly in javascript via Espruino API for SPI I2C or digital/analog pins or you can add it (possibly later) as C code into espruino firmware - making it not generic.
Then additional issue is updating the firmware over bluetooth without taking device apart. This is what I've been focusing on - finding off the shelf watches and fitness trackers that use older nordic SDK11 which allows replacement of its firmware without opening the device. As pinetime devkit is already opened and SWD pins are accessible this is not relevant here.
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fanoush
This https://store.pine64.org/?product=pinetime-dev-kit watch dev kit from the Pine people seems to be based on the same chips (Nordic 64MHz nRF52832 ARM Cortex-M4 processor) and RAM/flash as the Bangle.js. Does this mean that a clever enough person could port Espruino (and the Bangle firmware/software) to the Pine-watch?
Andrew