I researched the masks myself before applying for 501st.
Clearly the choice for masks are yours. I can only say that even trooping in my set up (which is VERY friendly) I still sweat a ton. I have done cold arena's, outside, and AC'd cons. Keeping the mask attached is always an issue. And that style of mask would make it even hotter and more difficult. And no matter what you may think, in order for that mask to look right it HAS to be glued around your eyes. Otherwise it makes the whole "look" seem unrealistic.
No offense to anyone that may go the full pullover mask route, but without glue on the eyes it's very easy to tell it's a mask due to the eye separation.
I don't mean to sound snobby. I just think if we all spend $100's-$1,000's on these builds, we all clearly have passion about what we do. And wouldn't want to settle for an unglued mask as the "final touch" to what no doubt will be an amazing build.
Best of luck and if I can help anyway let me know.
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