The premise permit only covers possession at the specific location. That is why it doesn't allow concealed carry. If all you have is a premise permit you can CC or OC all you want as long as you do it at that premise.
I am licensed to possess a firearm in most of the state (except NYC and a few specific areas like schools and so forth). If I were to OC, what would they charge me with ? Can't be possession, my license covers possession. There isn't another charge to be levied.
Not wanting to get in on the argument but i think they could charge with Brandishing?
Just thinking off the cuff. Only thing i could think of.