But Belloq isn't a lesser character, yea he isn't as cool as Toht but Belloq was the main bad guy so I don't see why you would save him for later.
sorry, he's a good foil for Indy in the story but boring as donkey balls. French guy in suit = yawn display.
to paraphrase from High Fidelity:
"The making of a great figure line like breaking up, is hard to do and takes ages longer than it might seem. You gotta kick it off with a killer to grab attention. Then you gotta take it up a notch but you don't want to blow your wad. So then you gotta cool it off a notch. There are a lot of rules."