Read my post a little below this, 9 months....clowns still wont associate. It shows a very similar situation, although I never had them with a carpet nem (is your a true carpet or a haddoni, big difference for the clowns)
I would advise the same thing that worked for me. Watch the videos, the bond took seriously less than 30 minutes from the time the anemone hit the rock till the female Onyx was in it.