I remember discussion about the possibility of commercially available Blue x Channel Cats, but not whether anyone had succeeded in finding them.
You guys please correct me if I'm wrong, but I think all that is needed to avoid successful large catfish (CC, BC, FHC) reproduction in ponds is 1) no nesting cavities and 2) presence of fair-to-middlin' predators to eat the slow catfish fry (even BG probably sufficient for this as well as providing forage for the adult catfish).