If you have to use a dry yeast, the only one remotely close would be T-58. But it's not nearly as attenuative as 3711. I recently made some beer with very similar gravities and grists, with 3711 and T-58. 3711 finished at 1.004, T-58 at 1.014. But, "saison" is sort of a catch-all category, and it can mean whatever you want, really.