Cool project! Epaper is awesome and crazy microfluidic tech.

The M5stack M5paperS3 is 60€ (56,70€ at Tinytronics in NL) and is auch more readable size, integrated battery, 4.7inches. More like an older smartphone screen and have very fast refreshing.

Nicco loves Linux (KDE contributor and a sort of blogger) made a whole to-do app/system that runs on it so it is temporarily out of stock at Tinytronics, but I think the problem with the small screen is having to refresh >3x as much to read the same amount killing battery life on an already smaller battery.

I think personally I would have trouble either with font size, or only being able to read a few sentences before scrolling.