[frxx]

I was thinking to do the same thing and have been considering an eInk phone like the Hisense A5. I'm thinking the eInk screen will take the fun out of many things, but will still allow you to message your friends/family. They're not cheap and some of them don't allow custom roms, and I gotta say, I would like a smaller one than the ones I found on the market, but still an option.

Another idea is to turn your phone to BW mode. In iOS this is possible with the accessibility color filter, for Android there should be an option in the developer options. I'm using that for now and I think it helps a lot.