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No calibre is not going to make arbitrary changes to the input document during conversion, that is a recipe for chaos.
RTF output does not support languages at all, which is why it "works" for RTF, since Word will just use the system language for an RTF file with no languages in it.
You either have to edit the input document to fix the languages, or edit the DOCX file to change the languages. If you understand regular expressions, you can use the search and replace functionality in the conversion dialog to make the change automatically during conversion.
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