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I'm not sure Edit Book has a working directory--I think it may just keep everything in memory. I don't see one in the calibre temp dir, anyway.
Are you aware of Calibre's older 'Unpack book' tool? It unzips the epub to a temp dir, pops open a file browser and gives you a dialog to rebuild it when you're done. Default hotkey is 'U'. (Previously known as 'Tweak book' to us old timers.)
I'm able to use Edit book's "Open the directory (EPUB uncompressed) as a book" feature on that dir.
That's basically what you wanted, but with more steps? I don't know a shorter way.
And be aware, I don't think Edit book notices if the files are changed while it's running. File > Recently Opened Books > (current file or dir) is the quickest way I know to get Edit books to reload.
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