Uh.... yeah, if you made the entire brim piece out of a rubbery/flexible material you'd be able to fit the helmet on without issue. Might be a bit of a squash getting your ears in, but I'd say no more so than if you were putting on a normal motorcycle helmet.
At the scale of 293mm, as I suggested initially, you'd have 174mm of opening at the widest point of the brim, just beneath the backs of the side vents. I do believe that'd be manageable.
At the scale of 293mm, as I suggested initially, you'd have 174mm of opening at the widest point of the brim, just beneath the backs of the side vents. I do believe that'd be manageable.