In what way is disabling syncing not working? I very rarely sync my Kindles, keep wifi off most of the time and I have no issues.
Newer Kindles let you add your own fonts. Kobos do too, but for sideloaded fonts to work properly on a Kobo, you'd need to patch it (not difficult to do). Kobo also needs registration. Granted, book organization is better on a Kobo, but again for the best results you'll need to have your metadata correct. Neither Kobos nor Kindles organize by file names, so merely renaming files won't work.
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