The only challenge for him would be Clark Kent, but the same could be said for every actor who plays Superman. If you fail, you make all the other characters around you look like an idiot for not realizing you're the same person. What I wouldn't give for *some* reference in The Man of Steel to a "perception filter."
For a moment there, I was afraid you were going to recommend they use that ill-advised story from the 70s where the lenses in Clark Kent's glasses helps him hypnotize others into believe that Clark is older, dumpier and generally less physically impressive than the Man of Steel.
For those of you who have never read or heard of this story: No, I am not making this up.