Do you have an Android phone by any chance? That's simpler than finding a workaround for iOS restrictions.
Easier thing to do if you're iOS only is put Calibre Portable on external HDD and just use friends' or public computers (maybe in public library?) to transfer books from HDD to your Kindle.
As the name implies, Calibre Companion is a companion to Calibre. It's not meant to replace Calibre.
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