I am not sure how they are going to handle the face, considering the numerous facial expressions Deadpool has all from within the mask. For all we know, it could be a digital mask created with motion capture technology.
But for the sake of brainstorming: you could check out TJack's universal face shell. I've seen it used for a number of costumes outside of the Spider-man universe.
As for whiting out the eyes, I recommend perforated vinyl. This is the stuff that they use to advertise on the sides of buses and cover the windows. From outside, someone sees a picture, but from within the bus, the little holes allow for some pretty good visibility. I use it on my Red Hood helmet and it is great. Generally though, it can only be purchased in bulk, so you are better off contacting someone like TJack and seeing if you can purchase a small amount from him.