I highly doubt doing this is feasible. Remember that results from multiple plugins are combined and ones that cannot be combined will be ignored unless you actually pick them in the results list (or they are automatically picked during a bulk download).
If you want some way to know that you have done a download for a book, a better option would be to modify calibre to add an option to set a tag after downloading metadata. Or do so manually on all selected books after a download.
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