What you want to do is not only possible but trivial, though I have my doubts how satisfactory you would find the experience. You should consider a normal Android tablet if you don't need the e-ink display. Bear in mind that an e-ink device of the type you need is basically an Android tablet with an e-ink display. But many Android apps are designed for colour, and some apps can be unusable. Also, battery life is comparable with a tablet rather than a dedicated e-ink reader. And if you did go ahead, the old NST would not be a good choice.
All you are really describing is an Android e-ink reader with a keyboard. A search on the forum will find a few choices, and they are becoming more prevalent. Bluetooth is probably a must, since it is probably the easiest way to get a keyboard working. You should confirm that a bluetooth keyboard will actually work with whatever you choose. Support for the Google Play Store out of the box or at least the ability to install it would be good to avoid a more complicated process installing a text editor of choice. Onyx make at least one model with relatively recent Android and Bluetooth. The T68 has a 6.8 inch screen. The Boyue T62 is also sold under other names, but does not have bluetooth support. The keyboard and e-ink tablet will remain separate units unless you can locate a suitable cover with provision for a keyboard. I know there used to be such covers sold with bluetooth keyboards for some popular tablets such as Samsung Galaxy models and IPads. If you don't mind this a foldable case at least will make it practical.
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