Yes, I'm thinking of making this a thing. Background: We have an armiger in the party, and I'd like to make it so that he can actually keep enemies on him. He's a 3/4ths BAB class, so relying on hitting them to hold "aggro" is a bit annoying. I'd like to support the character concept a bit better than is currently supported.
So...
Greater Antagonize
Benefit: You may use either use of Antagonize as a move action, but no more than once per round.
I think that if this wasn't for a specific character, I might ignore my rule of "no limits per day on (Ex) abilities in feats" and add that this can be used 1 + mCha times per day... But this guy has a 6 Charisma.