You could try using the Vlasovsoftlauncher "File Manager" to "Clone" your edited "epub.css" and name it "myepub.css". You should find it on your list of .css in KOReader, now. A long press on it will let you set it as the default. "Auto" will probably still use the epub.css. Now the question will be if the OTA processing in your device will remove your new .css? There is no need for an update to do so, but it might have been written to do so.
Luck;
Ken
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