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As long as you're willing to forego using calibre's Beautify feature, and you don't opt to automatically correct the problems found by the "Check Book" feature, it has been my experience that calibre's editor will happily preserve all of the html entities that are present in any of my epubs' html files.
And in all fairness, there are similar features in Sigil that will cause all entities to be converted to characters, too. You have to manually add all entities you wish to preserve to Sigil's Preserve Entities list if you want to use all of its features AND keep specific entities as well.
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