If, by some chance, you sacrificed Sunday's opening session of ''60 Minutes'' to sample the premiere of ''Punky Brewster'' (NBC, Sundays, 7:30-8 p.m.), I have an antidote for your overdose of artificial sweetener: It's Your Move (NBC, Wednesdays, 9:30-10 p.m., starting Sept. 26) stars the least ingratiating youngster on TV: Jason Bateman as Matt Burton, a 14-year-old wheeler-dealing con man who is convinced of his own charm. The character Jason portrays is as thoroughly distasteful as the whole show, which revolves about Matt's attempts to keep his patient Mom from being a good mother.
Matt schemes, lies, tricks, manipulates, to get his way. Other than his mother's dates - she's a single parent - the foil for his nastiness is most often his best friend, an overweight youngster, constantly eating and the butt of a never-ending series of tasteless fat-boy jokes.
Soleil Moon Frye, the star of ''Punky Brewster,'' is a charmer in her role as an abandoned child who moves in on an aging widower. But she is directed to be so persistently precocious, so calculatedly cute, that a viewer begins to yearn for the hard-edged, ambush questioning going on simultaneously on CBS's ''60 Minutes.''
Jason Bateman, however, in ''It's Your Move'' is a smarmy character right from the start, just about as cute as a pet marmoset.
So, Punky, meet Matt. If there were electronic cross-pollination, perhaps CBS and NBC could combine the characters of the two kids. Then we might end up with one honest-to-goodness youngster recognizable as a real human being.