Looking for an open source e-ink reader/tablet. The ideal reader…

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https://github.com/joeycastillo/The-Open-Book
Looking for an open source e-ink reader/tablet. The ideal reader would have the following characteristics:

Must have:

Supports open file formats (especially epub)
Waterproof (preferably IPX8)
Large screen (6" +)
$0 - $200 price point

Preferred:

Open OS (Linux / BSD)
Open hardware
Long battery life
No assembly required
Ruggedized
Easily replaceable battery (preferably 18650)
Easily replaceable memory card

The Kobo H2O Edition 2 seems closest, but I wonder if others have better recommendations.
https://goodereader.com/blog/electronic-readers/kobo-h2o-edition-2-review

The Open Book Feather is promising, but too small and fiddly right now:

https://github.com/joeycastillo/The-Open-Book