While I dont disagree, with what you are saying, that a specialty helmet is probably not going to happen or in very rare circumstances, I dont believe the money used for those helmets will be used for NIL.
If I remember the money for those came from the Gridiron Club, which is still active, but I don't believe their money is used for NIL. I am not sure it can, due to the restrictions.
You may have meant that people giving to the Gridiron Club will now give to NIL instead, which is possible, but I still think the GC will continue, maybe with a bit less funds.