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If an ePub renderer ignores the zero width joiner, I don't think there's much you can do.
Hmmm.... I seem to remember that one renderer would no break a work if it started with a soft hyphen. Worth a try, but I'm not optimistic.
For Apple's iBooks you could use the {-webkit-hyphens:none;} CSS attribute. But I don't know how many other renderers take notice of that non-standard CSS.
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