The specs normally aren't under the glass.
Most folks write on top of the glass, then apply the finish, which protects the bow as well as the markings.
I'd redo the specs, then spray a rattle can finish over the markings. It should only be a small area anyway. If the finish that you spray on doesn't totally match the finish on the rest of the bow, or glossier, buff it out with 0000 steel wool to blend it in, polish it good with a soft cotton rag....try it.....I'm thinking you won't even be able to tell that you've worked on it.