An original Kobo Aura H2O is more waterproof than later "coated" ereaders. Plug in USB and seal big slot (or trim cover if not lost) after taping over the SD card and reset holes. No jailbreak needed.
USB networking.
But Renate's idea is fine if you can find that model or a compatible one.
There are big variety of eink panels for RPi and a case to take both is readily available. Glue panel to a cut-out in case with a gel glue (not superglue as it will crack) or use a polarised matt filter.
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