Got one of those little Xteink X4 epub ereaders. Fits in a shirt pocket. Flashed it, upon arrival, with the alternative firmware called CrossPoint Reader, which has a tidier interface and some useful features. (MIT Data Science book, by John D. Kelleher and Brendan Tierney, from Humble Bundle.) The X4 has no light or touchscreen or highlighting capability (though it does allow for screenshots), and that’s OK, and should a future version come with such things, I can turn this one into a TRMNL.