More signs that Columbia TriStar Television Distribution is seriously considering bringing out a syndie talk-variety show hosted by Donny & Marie Osmond: Dick Clark Prods. is shooting footage for a sales presentation reel this week at CBS Television City. CTTD and Dick Clark Prods. officials declined comment, but sources say the studio is staging mock shows this week in part to get a feel for how the brother/sister teaming plays with audiences and celebrity guests in the 1990s. Donny & Marie hosted their own ABC primetime variety show from 1976-79. Dick Clark Prods. most recently worked with CTTD on the talkshow “Tempestt Bledsoe,” which aired during the 1995-96 season.