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If the external editor in question had it's own WYSIWYG editing/rendering capabilities, I would think you would be able to use those, but I wouldn't swear to it. You might potentially have to change some settings to make sure it's generating xhtml that Sigil will be able to deal with when it gets it back. But a more fully-featured xhtml editor that would let you edit the markup (and maybe even preview how things would render) should be doable. That's part of the reason the "Open With" feature (of which the preferred external html editor preference setting is a descendant) was created in the first place.
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