Its gonna be realy hard then if you go to a con.,etc. then....Have you ever thought of using that netting stuff that you see on evry Halloween mask then in some areas of the helmet? The pics. are a bit fuzzy, so I cant realy tell all the absolutes about the design, but if you where realy concerned about breathing, I think I'd recommend looking into it or something.
I personaly dont find it that hard to breath in my Mando, but as all my friends can tell you, I breath preety deep because of all the talking I do.