If you're handy with a hex editor, you may try to modify the CPS and see what the radio is actually capable of. A radio rated up to 50 MHz will have some spill over performance above that. It's just a matter of finding out how much. The good ol' X9000 syntor would cover all of 10 meters AND all of 6 meters.
Also, just because no one has made them go out of band yet, doesn't mean it can't be done. I've moved Motorola radios all over the place, including places where people said they couldn't go.