Turns out that PDFs with simple layouts are readable by enabling "Reflow text" and "Crop margins" in the Bookeen Saga. Headers are still displayed but I can live with that, as long as footnotes are preserved.
I guess I'll just get a 10" e-reader for the times I need to read PDFs at home, and forget about reading those on the 6" reader while travelling.
I'm still curious about why PDFs are a problem on small e-readers, though. Is it because PDF is actually a graphical language underneath, with no notion of text (what looks like text to humans is just graphics under the hood, and could just as well be pictures), so the software can't easily "reflow" the text to fit a smaller screen?
Also, what does k2pdtopt really do? Besides cropping pages to remove useless space around each page, does it try to move "text" chunks around so they fit in the screen, ie. update their x,y coordinates?
For those not having Microsoft Word and its apparently excellent Reflow feature to read a PDF and convert it to text… what about the following :
PDF → k2pdtopt → Calibre/LibreOffice Draw → EPUB
?
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