Yes, that spray (alcohol, water, soap) is safe for any orchid, to the best of my knowledge. (At least any I grow, as I have used it.)
Regarding S/H, you will need to provide a dryer season for a nobile, so that means letting the pot dry out. An outside dish with water might be easier than using a resevoir in the bottom of the pot. Flushing will be very important to prevent salt buildup. Ray (Ray Barkalow is the originator of S/H) may comment here, or you can try searching some of his past posts.
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