ok yes i can se where that might prove a difficulty
Card into wrist flesh would be SO much less popular.
I forget as a restaurant magician i have a far greater choice of spectator.
Still, a quick glance at the wrist at the beginning will tell you if they're wearing a watch and card under watch is so easy to do for such strong impact i still think you should use it whenever you can.
When they're is no watch i quite like your suggestion of using the psychological deck vanish.
The idea of using Torn interests me but its quite a slow time consuming process which wouldn't fit well at the close of my own, fast paced ACR, and sounds like the same issues would be relevant with yours.