Actually, if you make a second helmet, and make the pink shard from the sniper rifle coming out of the helmet on both sides, it might be a fun little extra twist on the costume for conventions, and then you could have a normal helmet for other times.
I knew a guy who made a second chest plate for his Clone Trooper with a lightsaber blade and hilt projecting from it, and people at cons thought it was great.
At the end of the day, it's your costume, so if its something you really want to do, go for it.