[knallfrosch]

My solution is based on 12.48 inch Magic Ink Calendar:

https://github.com/speedyg0nz/MagInkCal

A 12.48 Waveshare eink display costs $175. Sadly haven't gotten it to work with the Raspi Zero and therefore can't use it battery-powered. Got an ugly cord right now. Running power to the right place through the walls is definitely dedication!