How do I reduce the light from the pop-up flash as a wireless controller on a Canon 7D?

What are the best work-arounds out there for dealing with the built-in flash when trying to use the Wireless Flash feature of the 7D?

Is there a Canon version of the SG-3IR? Or do you use a modified version?

Are there camera settings or techniques that eliminate (or almost eliminate) the light from the on-camera pop-up flash?

In my specific situation, a model wearing glasses and looking at the camera gets the built-in flash reflecting off her glasses. I'm using a wide open 50mm f/1.8.