You can mitigate your chances of losing access to the particular version of the book by choosing a book that will likely continue being published, like the bible.
The Bible is probably one of the worst possible choices, actually. There are
literally hundreds of different versions, with each version having dozens of editions, and even the same edition of the same version being different due to having multiple publishers and/or printers. Even something as simple as line spacing being slightly different or page size being slightly different and your page/line/word schematic is rendered completely useless and your coins completely inaccessible.
With a bible, you can modify the procedure so that each word is from a particular bible verse. You could give each book an index number, then use the xth word in nth chapter of the book.
You still need the right translation, but there is less variety among editions, and translations don’t regularly change