You could have simply duplicated the problematic note (right click > duplicate), kept the new copy (which should sync fine) and deleted the old buggy copy. In case other notes linked to that note, you would have had to manually update the internal links from the old copy to the new copy. The backlinks plugin would help a lot locating all the notes with internal links to your problematic note.
If nothing else worked, you could have started all over. JEX export, victor plugin etc, see How to fix synchronisation issues and start over