I haven't heard from anyone - is that a lack of interest, lack of bugs, or something else?
I'm particularly interested in hearing from people with older Kepubs, in case they've changed their filenames or insertion code. I've tested it on some of my own files, but I got a test file that was very different (using kobo-android.css rather than kobo.css, for one thing), and I'd like to make sure there are no other strange variants floating about.
In addition, would you rather see the one-routine version or the two-routine edition? If someone's doing both tasks, the combined routine is more efficient than both individual routines.