Based on all of the feedback and a couple of other threads, I am going to set this orchid with its roots on top of some leca in a clay pot. I may add a little sphagnum. That way I can water daily and have the roots dry the same day. I'm hoping the daily flush of water will allow me to rehydrate without rotting the roots.
I always thought a cattleya was a cattleya. C. Walkeriana sounds like a different animal. I learn something new from this board every day.