An "e-ink typewriter" that can only do one thing

You can use NEO Manager (the desktop software) to put text files onto one of the 8 file spaces — on the Neo2, at least. I’m not sure about the other AlphaSmart devices. (Having said that, while I love writing with it, I don’t find it a great environment for editing anyway, so you’d likely only want to do that to continue building on an existing document, not to line edit.)