I honestly think Filmation Kowl should be packaged with Kowla (his girlfriend) and Red Eye (his evil cousin). They all use the same basic "owl" buck, so that would be money saving, probably the ONLY way we would get the other two and it could be $20 still!
I do want toy colours Kowl the most, though. He's an easy repaint. They could make a variant of the Owl set...or package him with Toy Colours Castaspella who they could make Allepsatsac, her evil cousin from the Golden Books (also, an easy repaint).