There are a few writing appliances out there trying to do that, but they are all based on proprietary solutions. It _might_ be possible to get a decent e-ink di

There are a few writing appliances out there trying to do that, but they are all based on proprietary solutions. It _might_ be possible to get a decent e-ink display with a passable refresh rate at non-monopolistic prices and bypass the Rube Goldberg-esque setup by just plugging that into a Pi via SPI, but right now there just aren't many options for that out there.