Oh, and as someone that's spent years proofing/annotating, I'll stick to text only on epub, because I can read that via calibre into a text file.
The Stylus based "annotations" is like a pencil in a book. No use for word-processing. I'd only use it on some PDF instruction manuals I ONLY use on the Sage. Maybe sometimes on service data PDF on the Elipsa, but I've not tried that yet.
I've worked professionally as programmer. Doing what you suggest isn't like dropping in Plato or KOReader as they are separate applications. Maybe KOReader can read the digitiser, but it likely wouldn't be able to use the Nebo app.
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