calibre doesn't sync with anything.
But if you need something portable, my suggestion is a Windows tablet or 2-in-1. I don't know what you would have to copy to the tablet or 2-in-1 in order to get the highlights. Bit whatever it is, you would have to copy to use on the home computer.
But using FreeFyleSync would mean only copying any changed files. My guess is copying the library.
There is no eInk device that will do what you want.
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