I personally do this and don't find any problems with it. As soon as you understand how to setup everything properly at LibreOffice, it ends being easy to convert any docx to epub with Calibre.
In mines, with LibreOffice+Calibre, all I need to do is to change the default CSS of the epub generated by Calibre for the one I previously made, add a cover and an index and it's ready to roll.
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