Any idea I come up with is a waste of time, I know....but,
Both!
Make one screen eink and one screen lcd. The waste light from the LCD acts as a light on the e-ink for lighting in the dark (if you must use it in the dark.) Either one can be the screen and the other the touch keyboard, and you use the LCD for video and other color (and or high-speed) applications, while you use the e-ink side for reading (or the LCD side instead, if you prefer).
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