IIRC PDF uses Postscript internally not HTML.
But maybe you don't need calibre to convert an ODT to PDF. One of the better features of Libre Office Writer is producing PDF's.
In Word I would make use of a Section to suppress page numbers on the front matter pages. Writer has Sections, given Writer started life as reverse engineered Word '9? it's quite likely its Sections are a clone of Word's Sections.
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