I can't speak to e-ink but regarding screen time addiction, I used Gray-Switch (https://play.google.com/store/apps/details?id=com.vegardit.g...) to turn my phone display black and white, and immediately my phone use decreased by 66%.
It really reduces the intensity of the phone - you never realize just how garish the color choices are for almost every app out there until you see it in B&W.
The search box in Settings will probably find it if you search for gray or reading.
This is on LineageOS 18 (Android 11), though I recall it being mentioned in some Google events/announcements so I'm 99% sure it's a core Android feature and not something specific to LOS.