Not having a magnetic in front of me, I looked at the cover of publication you posted a pic of, it appears you may have to make the 50 and the 80 SMALLER as well to accommodate the odometer ??? (Hard to tell by just enlarging that publication image.....thats a point you'll need to verify.)
Maybe to you could change it to read "chronomagric" just to see if anyone notices? The print is tiny enough to work since we all need glasses these days anyway!