Spaths being a terrestrial orchid, they might start easier from seed, I don't know for sure. I know I've had pods but don't know if any seeds germinated.
But I'd set a pot of seed starting mix under those pods, and let them drop their seeds. See what happens. The pods will puff up, turn brown then pop open.
Other orchid seeds are tiny to microscopic, but since these orchids grow in the ground, they might have bigger seeds.
