https://github.com/koreader/android-...5d081939895d48
As of today, the pull request has been merged and expected to be included in the next KOReader release!
(If you're impatient, I did make a test build with my own keystore.
https://github.com/hanakomisa/androi...b300propertest)
Again, I couldn't have done this without Waldy's testing, and dboleslawski's original code which I took and improved upon. Thank you all.