Does Hulk know what the helmets are for? Does he have that level of thought in Hulk form? Thing was involved with the god machine stuff I think so he'd probably know what they're for. I'm assuming Dark Beast would of dealt with Juggernaut or *A* Juggernaut in his time line so he would probably know. *We* know what the helmets are for but some of the combatants might now know or have the level of thought to remember.
I know if I was a scientist and found another way to defeat an adversary that requires less manpower, should the time arise, I'd at least research the method as best I could until I knew the base mechanics behind it. Now if I was that same scientist with twisted morals, I'd probably have one built or at least be able to readily make one.
BUT... this is all assuming Nimrod did the same to Dark Beast's time line's Juggernaut or he found out about the method when he was in the "normal" time line and that he could develop a similar, probably lesser, weapon and that one of the other two characters would take off Juggernaut's initial helmet and that Thing and Hulk could be immobilized by intense pain too.
There's also knockout gases for those who need to breathe. It'd have to be a gnarly gas but I heard Batman did it to Hulk.
If all else fails, he can do handsprings around the muscle heads with his sandwich. Guh, I spent half the time thinking about sandwiches. I'm hungry.