How are your Android programming skills? Also you know that e-ink is not a fast response medium.
To do what you want will require programming an app that interacts with the e-ink screen as there is nothing like that at the moment on the devices.
One thing you can do on the eDGe e-ink screen is make written notes with wacom stylus which can then be exported to other devices and OCRed.
Since the two screens are interlinked you can never completely shut down the LCD although the backlight can be turned off.
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