Update-This morning I found this Sobralia blooming. Maybe the cooler rainy weather improved the bloom, no idea. It's not a very showy bloomer with the flower remaining fairly closed and facing downward, which would help keep the inside dry in this rain. But it's nice to see what it is.
In any case, I'm fairly certain that it's Sobralia mucronata. But if anyone has an alternate suggestion I'd be happy to hear it.