Every setup is different, and the owner needs to stumble through learning. Your setup sounds great. Potting in sphagnum should work fine unless the misting system keeps it wet. Some of your orchids want to be wet but others don't.
Most people don't run fertilizer through the misting system because the evaporating liquid leaves behind salts that might clog the emitters.
Watch closely through the first months. Plants respond quickly to excessive or insufficient light, and most people move plants around some until they settle on a spot.
Your plants should be fine with somewhat higher daytime temperatures.
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