I have a few vials waiting to use for a saison I have in mind, I just don't have any open carboys or fermenters at the moment. Good problem to have. I am excited to use it!
Without knowing exactly the yeast, since it is proprietary, my best guess is use White Labs Saison I (duPont) and then pitch Brett. Bruxellensis (orval) at the same time as the initial pitch. You could either get a vial of the Brett or pitch a couple of dregs of Orval bottles into the fermenter. Or you could wait to pitch the Brett after primary fermentation is complete. Is seems like a lot of probrewers prefer Brett. anomalus, but I have not seen that on a homebrew scale. So, it could be that strain a well? It is reported to be one of Tomme Arthur's Lost Abbey farmhouse ale strains, so if you can get your hands on a bottle you may also be able to build it up to a pitchable size.