While I can understand why docx support might be useful, I do not see how it would help you get a view of how thinbgs might look on an ereader. As far as I know none of them support docx (or even doc) natively. The "Save as Web Page (filtered)" option in Word is likely to give the best results as it removes any docx specific formatting to give.HTML that ebook formats are likely to support.
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