Thanks for the offer:
https://we.tl/t-KA9InMaCCd
It looks much better. I just need to leave a bit more on the right, before merging the pages back into a single PDF.
k2pdfopt input.pdf -m 0.8 -mode fw -ls- -o output.pdf -p 30-40,70-75
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Edit: While we're at it: Can k2pdfopt crop such and such page, and then turn them into pictures in place, without having to do this myself?
ie.
1. Use k2 to crop margins and rescale text
2. Export those pages
3. Convert to PNG
4. Convert to PDF
5. Merge all pages into hybrid PDF (text + pics)
Or maybe k2 can massage the PDF in such as way that there's simply no need to turn problematic pages into pictures (eg. tables, insets, etc.)?