I first got a neoprene half-mask. Too damn hot, can't bear it for more than 5 minutes, so I moved to a mouthpiece, like hockey players use. Very good fit and all, but impossible to talk on the radio, so when I browsed ehobbyasia for some stuff, found this (not actual picture, took it from an earlier post in this thread)
I removed the lower mask, got rid of the shitty goggles, and using 2 small tie-wraps, attached it to my ESS goggles. Voilą !!
Now I can freely speak, it does not fog at all the eyepiece, and I don't worry about being shot in the face anymore.