In trying to think outside of the box...
It seems we're assuming that the "sanctuary" we're solving for with the grid is the place where the token is hidden. It seems to me that it could just as easily be the place within the text where the directions to the token are hidden. Could you create a grid using numbers and letters to lead to the text page for the specific critter and where the code is hidden eg pg 67every2ndword4thltr?

Or maybe it's because I'm a novice with grids and don't know any better.