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@Gordon
The flashlight is a great idea! I don't think there's an easier way to get at the LED than the 'LED' pad. Those will be connected to the backlight, and the only control we have is on/off - they go via a FET.
I'm not sure 100% but the LED pins will have their own resistor as they are for the backlight, but if you're lucky, it might be that LED- is a FET to GND, and LED+ is the resistor - so to attach your own LED you can ignore LED+ and connect your LED and resistor between LED- and VBAT.
There is another option...
On the PCB there are UARX/UATX pins which are unused and brought out to pads (https://www.espruino.com/Bangle.js2+Technical#gpio). You could buy a surface mount FET device in something like a SOT23 pack, then scrape a bit of the solder resist off the PCB near UATX (under that is a ground plane) and solder the SOT23 to the board - and then you can connect a LED via a resistor to VBAT and you've got pretty much as much power available as you want.