Just get some crushes grapes from them after they're juiced... Yeast doesn't actually go airborn as much as it catches a ride on dust or pollen.
As for collecting them in small starters, sounds good. You'll play hell finding anything that puts off dog fart aroma. I just don't think those compounds are produced by saccharomyces. Hop your starter heavily, it will keep the unwanted cooties out.
On Deck: Saison "Jardin d'ÚtÚ" (3rd Gen 3711, Wild bugs, Pale ale malt, wheat, Willamette dry hop)
Primary: Saison "Vomissure de Grenouille" (2nd Gen 3711 from dregs, Pale Ale malt, Crystals and Willamettes)
Secondary: BM45/Spontaneous Bugs Experiment (down to 1.004, and tastes awesome), contemplating what fruit to add.