Have you tried dropping your OpenOffice document into Calibre for conversion to EPUB? Then tidy up in Sigil, or even give Calibre's editor a try - it seems remarkably similar to Sigil in all but appearance.
If your OpenOffice document was constructed "by the rules" you'll get pretty clean code. Or you might have some work to do - but anything's better than pasting paragraphs across one by one, surely?
And there's no need to obsess over achieving minimal EPUB code. That's not what the reader sees. If it works...
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