BOOX Vector PDFs Are Already Colored
After my interesting journey into replacing greyscale values in the vector PDF export of Onyc BOOX Notes, some brainiac on Mastodon pointed out that there are non-grey colors I could use. (Seriously, thank you Jeroen :))
So the solution is to simply use colors, not shades of gray!
That’s even less work for me, which is good, but I’m still a bit sad that the PDF recoloring experiments have now ended.