Dear Bola de Fogo,
Thanks for sharing. Note that the calibre devs keep an eye at these posts as they updated to the latest version as soon as I linked to it. So, perhaps, it is a good idea to post the recipe at Euler's original post as well, which I couldn't find. Here is one thread about that version, though:
https://www.mobileread.com/forums/sho...d.php?t=146959
Up to you if you want to leave a heads up there.
Best,