Wayner -
Turns out StereoLink ships all their ICs with a removable RF block on one end (didn't know what it was so had to call them). Don't know if it's something that would work in your case, but if you want to give it a try I've got one I'm not using. PM me with mailing info, I'll pop it off the IC, drop it in a box, and send it your way. It's only about 1"x1 1/4" cube.
JD