FPS TFP Shadow question

Hello all, I have a FPS setup with weapon and arms only. I want to be able to see feet and legs so I put a custom mesh of a character behind the camera so you can see the legs and feet. Looks great. Issue is, the character mesh arms were in the way obviously so I did a hide bone node and now my guy has no arms. Great. Problem is now its obvious when the shadow casts on the wall and you see a body with legs, torso and head with a floating AK.

So I am wondering is there a way to cast a false shadow on the wall that would display arms? For some reason Iron Belly’s FPS arms cast no shadows no matter what I check. So I am in a bit of a dilemma here regarding the shadows.
Any help would be greatly appreciated thanks.