Well that explains a lot. There's perhaps one problem though, the custom CSS file is specific to each device. You can put it on yours, but if you give the coveted book to someone else you either have to also put the custom CSS on their device (assuming they're also using Kobo readers). It's more work for you, but you may be better off if I understand you correctly to edit each ePub file to either remove the hyphenation or add the custom CSS to disable hyphenation to each content file.
One thing I could perhaps do is to add some code to give a "disable all hyphenation" option to modify the book and add the custom CSS to a book's content files for you. That'll be a few days for me to do and test, I don't have a lot of time each day.
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