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Nope...
The only way would be Search and Replace by a character placeholder which you were sure it's not used in your text.
Somewhere I made a suggestion about using something like a "white-list" of named entities in order to help handle situations like this. Calibre encourages the use of Unicode characters instead of named entities. But the problem appears with invisible ones. Maybe a customizable list could be used so with certain chars Calibre worked the opposite way. But maybe it's too much coding effort.
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