Rich,
I understand what you want, just put the anamorphic footage into a 4×3 sequence, open the clip in the viewer, go the the motion tab and twirl down distort, and type -33 in the aspect ratio box. Done.
You will see the edges of the clip in image and wireframe spread out and crop the sides.
But as I said in my first post, you will have to shoot wide enough to be able to lose the sides.