I would pay for a decent sized e-ink screen with a stripped down browser that could integrate with a desktop bookmark app and save content for later reading. Not this "experimental" browser in my Kindle.
Or they'd just attach a small digital output screen akin to those old typing machines that you'd then push to the main screen when done. Still wouldn't use much of the battery at least, but would look ugly.
It's surprising to me that the Yota phone [2] design didn't catch on. Having both a normal screen and an eink screen would be a killer feature, since most of what I do with my phone is text based and doesn't require any color.
[1] https://www.kickstarter.com/projects/astrohaus/hemingwrite-a...