He will likely heal as he is but the scaring may interfere with the functioning of his eye lids etc. I have dubbed 1,000s of roosters it is a very simple operation and has so little effect on the bird that I often fed his waddles, earlobes, and comb back to him. (cut up in small pieces) Chicken blood is the worlds champion at clotting, I never had one of the 1,000s of birds I helped dub die from dubbing or an infection or even remember one that was sick. Dubbing is often preformed on straight comb breeding stock to keep the roosters from injuring themselves on metal feed troughs which can bring on cannibalistic behavior. How he will behave now that he is torn up and sore may be more problematic but I doubt that he will suffer from a good clean dubbing. If you use scissors he may register some displeasure from the pinching action of the blades. If you know what your doing a razor sharp knife is the way to go. It won't take over 15 seconds or so for two people to do it. One to hold the bird and another to play be part of the Mohel.
I can assure you that chicken flesh heals best if it is left exposed to the air, just keep an eye on him. PS: don't get anything like Blue Kote in his eyes.