Interesting. I thought that calibre kept the metadata separate so as not to potentially "corrupt" the library. Ah, but I've forgotten that calibre's library is a copy - not the original. So any changes don't affect the original in case of a real problem.
I was not aware ePUB doesn't support covers. Does it support images? Because if it does it is just a matter of using the one to perform the function of the other. Or is their some sleight-of-hand going on with the HTML/XML? Neither is an optimal solution, but if it works...
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