Copying Hand Item To Head Item Data

I've got a custom head that is equippable using a carrot on a stick and clicking (1.20.6) is my version, but I want to copy the hand items attributes, now yes it's a loottable but what if while I wear the helmet it takes damage, or it's somehow enchanted, I need that to be copied so I can take it on and off without data loss, any thoughts? Is there like a execute store replace?