I'm trying to plump up a similar terete leaved vandaceous species (cleisostoma simmondii)...
Anyway, I would recommend spritzing and spritzing (ie spraying and misting) with distilled/rain/RO water with a spray bottle. Or if you municipal water is clean then that should work too. Few times a day if you can and not so much water the pot too much, the stems and roots in the charcoal could rot. The plant can absorb water and reduce water loss through stems and leaves until it begins to grow. New growths will be plumper but old leaves will stay shriveled which is the case with most orchids.
Be warned it could take time before it decides to start growing in then, but in meantime reducing water loss through transpiration will help. I'd recommend using some sort of growth stimulant which I'm not sure what's available there. There are kelp solutions here with gibberellins is what is said to help kick new growth in gear. You would mix to dilute as directed for product and soak for a long time, but just the cutting.
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There are planting beds of this in the soil all over Singapore. Just look at photos from Singapore. It's hard to miss once you get accustomed to looking for literally tons of Miss Joachim in a boulevard strip, in front of shopping malls, in parks.
Motes Orchids in Homestead sells quarter-terete Vandas for Florida landscaping, and they say to plant them in the Florida soil. You can find photos and videos on their Web site and YouTube channel.
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