There is another point that someone brought to my attention over in the Kindle Developer's forum. Perhaps this is not the greatest idea for an edit plugin, unless the intent is to use it immediately before a KindleGen and then discarding the changes. You can see the full post here:
https://www.mobileread.com/forums/sho...99#post3256199
Quoting his main point "Most ePub rederers (such as ADE/RMDSK) will not properly display the hyphens and if you need to make changes to the ePub, the hyphens will get in the way. Also searching breaks with the hyphens."
Dave