The book my mother in law had which talks of a monarch was a slim book published in the the late 60’s with a comet on the front. There were a few quotes that i spent a lot of time trying to track down, and the only places were in that book (can't remember its name now).
I will see if I can find a copy of the book you linked to.
Unfortunately, I do not know how to find the prophecies in their original form. Desmond Birch spent years researching collecting them, including time in the Vatican library and archives.