so how does one establishment that just honestly want to ban GG to protect their customer's privacy release a pre-emptive statement like this without having it looking like a privacy stunt?
It doesn't. Whenever someone with GG enters the bar, kindly ask them to remove the glasses. There is no need to publicize this bad, except as a publicity stunt.
Considering Google Glass aren't available for the forseeable future, to appear sincere you should start by being in a geographical location brimming with Google engineers. Google has a small but growing Kirkland presence, but it's not nearly the size of many companies in Seattle.