Personally? I wouldn't mind them pulling a Gar Saxon, where the helmet is on in battle and off outside, but I don't want helmets on them all the time. Those ridiculously high maintenance are a huge part of how clones express their individuality, and it's important to show that.
I mean, we all know all the clones are brunettes. Rex is a bleach blonde with an eighth of an inch buzz. You know that man is in the barracks bathroom every morning taking care of those roots, and getting a steady supply of hair bleach when you're a literal slave soldier is not easy. That kind of devotion to hair care should not be hidden.