My opinion: abandon hope all ye who enter here. I don't see it being possible, much less easy, to run calibre on a google engine.
You would have much better luck installing it on a linux virtual server hosted somewhere. You could also use scheduled tasks (cron or what-have-you) on your home machine if it us up 24/24. Set up a job that runs ebook-convert for each recipe that you want to download.
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