Removing video backdrop flicker

Hi Gang,
I am using FCS3 and have all the software installed- motion, color, FCP, etc,.
This is less a problem with the software than a question about technique.
I have a video of a "talking head" interivew with an image from an LCD projector projected on a screen behind the interviewee. The interviewee is blocking some of the screen.   Pulling the HD 30p video from the camera and reveiwing it, I realize that there is an annoying, periodic, flicker in the image behind my subject as he talks. The image goes from slightly blue, to slighly yellow and back every few seconds.   This is really annoying and distracting, and I'd like to remove it somehow using some sort of matte, and replace it with a stationary image.
Since I would like to use many minutes of this video, I need a way of dynamically, instead of one frame at a time, subtracting the still (but constantly changing in color) background image, leaving the subject in the foreground. Unfortunately, I cannot shoot this video again, or I'd simply double check that I'm not getting mismatch between the frame rate of the video and the frame rate of the camera.   (Normally when I do this, everything comes out fine.)
Can anyone think of a way to do this?

Invest in Mocha for Final Cut Pro...
http://www.imagineersystems.com/products/plug-ins

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