I am on the same boat. Big head and eyeglasses Just got my eFX bucket just to play with and I had to remove some foam to make my head fit with my eyeglasses but squishes them painfully to my eyes. Short term solution is probably put padding in front of my forehead and remove the back foam for now.
Hopefully, my RS bucket would be the same or larger! If not, then I will try to check these thin press on optic films.