Good news, it looks like Android 6 has added the capability to show custom notification icons on the notification bar. I plan to add this feature in the next version of Automagic since it has been requested often.
Some restrictions will apply:
- requires at least Android 6
- the system enforces that the icon has one solid color (white) by painting every pixel in white when it's not transparent. I recommend to create transparent PNGs with an icon generator.
Martin