Well, I've been sitting here for a couple of hours and have managed to get the helmets to stick. I'm doing this for myself and no one else, so this really no worries of me leaking the method if I do figure it out.

I'd love if someone who knows how to stick the stats could give me a hint.. It'd be much appreciated. I've never really tried so hard to get a glitch to work, this is really time consuming and some help would be awesome.

EDIT: And yes, I've reset the game (And signed out) and the prestige helmets 1-7 are still there and they are able to be equipped. (Yeah I'm only 7th prestige, so that's why it's not 1-10)