Hah! I was wrong in a good way.
Turns out that when I convert the monster blocks back into LibreOffice, I don't need to delete the top row. The conversion removes a blank top row automatically.
WOOT!
Also discovered a pandoc command that will apply a template, instead of some more esoteric trickery to do the same thing.
WOOT!
Still have to touch each table to shade every other row, but that is not nearly as fiddly.
WOOT!
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I took the monsters section and exported it in something similar to the DMsGuild 5e adventure style and to Basic Fantasy style.