An excellent post. Let me make a few comments that may help you a bit.
1) Any plant can be grown in semi-hydroponics, but whether "you" (any individual) can do so depends far more upon their growing conditions and watering habits than it does the plant itself.
2) When you move a plant into S/H, the existing roots will likely fail, because they have grown to be optimized for the conditions they WERE in, so won't be optimal for the new conditions. That's why it's important to transplant into S/H right when new roots are emerging from the base of the plant, so they have the opportunity to grow and support the plant.
3) Referring back to my first comment, I have never said that dendrobiums don't do well in S/H culture. I have repeatedly stated that I cannot grow them that way. Others have told me they are ideal for the cultural method.
4) Nobile dens and other plants that require a "rest" are fine in S/H. You can either stop watering, as you would in traditional culture, or water it normally, but provide absolutely NO nutrition during the rest.
5) Your description of a "cold" winter concerns me. Most orchids like it reasonably warm, so if the air temperature is too cold, and the humidity is low, the evaporative cooling from the moist, open medium can lead to excessive chilling of the roots.
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