I don't know about the newer Kobos, but on my Glo even the 1% light setting is blindingly bright in the dark. The Pocketbook Inkpad 3's light is barely noticeable on the lowest setting, so if the Touch HD 2 is similar (likely), it would be a candidate to look at. It has physical buttons in addition to the touch screen, and a card slot. 300 dpi, which is as high as e-ink currently offers. No ecosystem, works well with Calibre. Some details
here.