Yes. Give him wavy hair. Make it shorter, especially back and sides. reverse the part.
Have Superman's hair be loose and tousled and Clark's be neat and in place. The movie pretty much did it the opposite way around - as did Lois and Clark.
For heaven's sake, have keep the hair (except Superman's forelock) away from his forehead. Keep it back and show the hairline. I don't know why they comb it down over half his forehead like that, it looks so lame. Reeve had the same thing in the first 2 movies.
In other words just make it like the vast majority of Superman comics in the last 20 years - that is to say, NOT STUPID.
The key thing is, Superman's hair is Clark's hair, messed up. Not the other way around, and not some ridiculously contrived... contrivance of hairgel and fake curl.
Kirk Alyn had it right. Not QUITE the right style but the right idea. Natural curl as Superman, nice and neat for Clark.
THIS is far closer to what Clark should look like:
Looks so much better - and mature. Just make it wavy (which would not be as obvious in this Clark mode), reverse the part and mess it up as Supes.
The problem is that the film-makers simply don't get or understand how it's meant to be. I can't see how you can surround yourself with Alex Ross art and not see "hey, the way he draws the hair actually makes sense AND looks good" but that's the case. They seem to WANT Clark and Superman to look stupid, as was the case with Superman 1 and 2. For Christ's sake, Sueprman is NOT have meant to have long hair, and you can't just slick it down to try and make it look short.
If no pictures show up in this thread, check out this gallery for the shots he did for GQ Magazine:
http://www.brandonrouth.com/gallery/thumbnails.php?album=118