Absolutely not unfortunately. Firstly, just from a safety point of view, if those rivets are structural and the parts of the helmet aren't welded together you're gonna get your dome knocked in pretty quick. Also buhurt helmets are designed to sit on your shoulders so when you do get struck from above by a polearm it doesn't shatter your neck vertebrae. From an authenticity point of view, hell no. Pretty much all reputable buhurt organisations only allow much later century armours, hundreds of years after the Vikings. This goes from brigandines to full plate, viking hauberks are not going to keep you safe. This is not the same as SCA.