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I still prefer Sigil, mainly because of the clips and saved searched. Although development has stopped, it works fine for me at the moment.
I never use the conversions from Calibre, as I don't like the conversions.
You mention that you use libreoffice. There is also a plugin for libreoffice to create an ePUB I believe. I don't know if that will split automatically. I know my add-in does if you want upon export, but since you don't use Word it is of no use for you.
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