Let it revert, I usually do, or did when I didn't have to have a 1st class. Under 40 it's good for flight for a total of 60 months. I usually encourage my career oriented students to get a 1st class the very first time they get a medical so they make sure as not to spend gobs on flight training and then find out they can't ever be a professional aviator.

No, he won't think it strange.