Idea for BTN1 shortcuts

I feel that it violates some of the Bangle principles, for example it shows
Gadgetbridge notifications smoothly integrated in the watch face and not via
the notifications app.

I think provided you document what the incompatibilities might be it should not be a problem.
For example I have two watch faces that are full screen and dont display the widgets; I
do load the widgets but then ensure that they dont draw on the screen.