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.
I had a similar high finishing gravity using T-58 in a Tripel. The half I fermented with 1388 finished at 1.010, but the T-58 stopped at 1.018, which is no longer a Tripel.
I really think that Saisons are pretty identifiable by the yeast and that if you don't use Saison yeast, you won't be making a Saison. What you make may be really good no matter what, but you may want to call it something else.