We (https://www.visionect.com/) have been making non-ebook based E Ink solutions for a decade now. Except for Joan, our room booking solution (https://getjoan.com), we have not found a customer application that could survive the low-volume incurred high price of an E Ink solution (beyond E book readers and Note taking to some extent).
LCDs are simply too cheap and when customers get the option of going for a 75" color LCD display for a price of a 32" E Ink, it's a really tough sell to the consumer. The application really needs to make sense.
If you consider yourself as an outlier from the general feedback we got from the market, then do let me know - the 13" devices we offer come with a years worth of battery, have WiFi built in and our software allows you to display any web-based content or upload images. They even mount to the wall using a magnet. You can buy one on our online store.