A little harder for you to get in Australia but have you given thought to a football helmet the Americans play with? The face guard could be modified with a holder and the helmet skeletonized to lighten it. Possibly some other sports helmet like a hockey helmet could be used instead.
Here is a 3D printable one that could be a starting point for removing the unnecessary material. https://www.turbosquid.com/3d-models...ush-3d-1423695
Pete