It's not hard per-se but they'd have to go through like every head/hood armor and make sure that it doesn't clip. That in itself would be a strenuous task. And then how do they go about replacing the glasses stuck to your noggin with equippable ones (to avoid 2 pairs being worn at the same time), since the glasses on your noggin wouldn't count as equipment; they'd be more of an aesthetic thing like a scar. (if that makes sense!)