I don't blame you for getting carried away I will comment only on the first two.
Asctm christensonianum has been reclassified as Vanda christensoniana. I grow these (in a greenhouse) in net pots fill with a spaghnum/bark mix (3:1 ratio) to maintain humidity around the roots. This way I only have to water once a week in winter, and twice a week in summer.
You can also grow it in the 'empty vase' method. Here you set it in a vase so that leaves stick out. Fill with water and let it soak for 15-30 mins; then pour the water out. Residue will keep high humidity around the roots. Do this twice weekly in summer, and weekly in winter. Add a few drops of fertilizer every 3rd time.
The Rhy Bangkok Sunset is actually Perreiraara Bangkok Sunset (Vanda x Rhynchostylis x Aerides). With the Rhy portion that diluted, you can grow it exactly as the first one.
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Kim (Fair Orchids)
Founder of SPCOP (Society to Prevention of Cruelty to Orchid People), with the goal of barring the taxonomists from tinkering with established genera!
I am neither a 'lumper' nor a 'splitter', but I refuse to re-write millions of labels.
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