It might be hard to staff while holding a black wing. You will have to put down the weapon every time somebody needs help.
I, on the other hand will not be cosplaying. I've actually never cosplayed. The attention one gets when cosplaying is something that I wouldn't want to experience. Giving people attention for their brilliant cosplay and taking there picture is more my style. I guess I'm too shy to cosplay.
The closest I've ever been to cosplaying is wearing a combat vest. But, I only do that to keep stuff out of my pockets, so it doesn't count. Maybe one day I will cosplay.