Show a widget only NOT on clock screen?

I don't think so unless you modify each App. Each App or clock is responsible for calling Bangle. loadWidgets() and Bangle. draw widgets().

Nah, not all apps. Just all widgets and the clock (the widgets are most likely to modify the clock when the clock isn't doing it itself [e.g. the lock widget when the screen times out]. The issue is ofc when a widget redraws the widgets when you are at an app, then you loose the digital clock. The only solution for this would be to know which app is loaded inside the drawWidget function, which I don't know if possible).

If you load your own library as function into it, it becomes as easy as replacing Bangle.drawWidgets(); with require("helper").drawWidgets(); in all of these files. A bit tideous and updating sucks, but hey, what one wouldn't do to have the watch just like one likes it.