Good question. I don't know the answer. I think the 2014s supported AZW3 so you might want to try that as your output format from Calibre. I say that because I'

Good question. I don't know the answer. I think the 2014s supported AZW3 so you might want to try that as your output format from Calibre. I say that because I've never seen any unavailable fonts in an epub > azw3 conversion.