RinoZ
Bishop or Orator would be the most logical choices given Beyn's fanatic personality. But didn't that translator use pheromones with her hand already ? (the one who helped the writer from the monthly gazette when he arrived at Renewal) Does that mean she already is an antspeaker ? But Beyn implied he was the first to evolve so...
I think Beyn will either go with Antbishop or Antorator. But since he can already do what an Antorator does and since chances are lower for another Antbishop to arise he will choose Antbishop. Also who doesn't want to have a religious service to the ants? Probably his reasoning will most likely be on the feverish kind and not the one I just presented, but the endresult will be the same.