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As far as I understand Excalibur, it also should be able to spellcheck and edit the clipboard so you could always copy the text in the current Document, spellcheck it in Excalibur and paste it back in. Unfortunately, Excalibur does not seem to provide a current OS X Service and the WordServices mentioned in their manual do not seem to work any more.
I thought you already tried that and still wanted to use Excalibur because it understands LaTeX syntax, but that's fine, too :)