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I use a lot of readers on my Android devices with e-ink: Moon Reader, 3 versions of Alreader X, Librera Pro, Koreader, FBreader and Cool reader. All of them can sync their reading progress - I don't know about highlights. I have them each set up to my liking for different kinds of literature in basically the same way I would be able to have multiple physical books in progress at the same time.
The easiest to sync are Koreader and Alreader X - the latter is my favourite in general. By default it's much nicer than Koreader. The developer behind it also does work for the Russian versions of Onyx's devices, so he provides a version which is integrated as a system app for Onyx devices.
Beware that some of them (Moon reader and Librera) are not optimized for e-ink and therefore lack options for controlling screen refresh and might require you to configure the theme to be completely black and white.
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