@
JGB - You can extract the metadata from a format file into an OPF file with the
ebook-meta command
With a bit of yourFavouriteTextEditor-fu you could wrangle/mangle the OPF into a CSV file and input that into the
Import List plugin to update publisher and publication date.
The OPF file is XML, there are some command line XML2CSV converters around maybe you could make use of one of them.
Would be nice if the ebook-meta program had a --to-csv option
BR