the thing is it's easy to accommodate this. you can take a piece of abs plastic, warm it up and form fit it to your (fillin in body part here), then you either contact cement (or you can get away with carpet tape) for the padding that you put on the plastic.
I've done this more then a few times over the years and basically I can take a howitzer off the protected area and not feel a thing. I typically don't do this because I have enough natural armour (aka fat) to keep myself from getting to hurt typically. (bruises do not count as injuries). I usually have done that to protect something that was injured that I stupidly decided to keep on playing anyway. But for the bicep area it would not be hard to fashion this, I guess I'm just kinda in bewonderment that I can come up with a solution for this in my garage but an organization with that much in resources can not. Heck you can get that Newtonian foam that instantly gets hard when struck, put that in the bicep area. That is really easy to make exactly the size/form you want. These shirts:
Max Cov Shirt - Zoombang use that foam and are made to help protect against a wooden sword (which hits harder then a puck). I wouldn't rely on one of those as the only protection, but I'm saying the foam in those when put on top of arm of a chest protector would nullify any impact.
maybe I should sell Elliot some custom protection