I am thinking of getting a large e-reader with bluetooth and wifi. This one seems to fit the bill:
https://onyx-boox.com/shop/onyx-boox-m96-universe-97-inch-e-ink-pearl-display-e-book-reader-google-play-ivona-text-speech-bluetooth-4-0-low-energy-powered-android-4-0-4/
With an external BT keyboard and a good stand, it might function as a workstation. Android is quite a powerful OS already, and you can already open a terminal and execute command line apps, surf the web with firefox or chrome and do wordprocessing or spreadsheet work.