Dolly, I have a few D. aphyllum/cretaceum/primulinum and D. anosmum, which I handle the same. I do leave them outside for their cool treatment, BUT, simply running them dry and right next to the window glass will give them some cooling (after all, you are in Indiana!). As these plants cover a wide range of growing conditions, some examples will be more warm-tolerant than others. Specifically, D. aphyllum is found from about 100m above sea-level to well into the mountains. One would expect the dryness with extra light (many trees have lost their leaves, as well) would trigger most to bloom.
All my plants have just lost their leaves this week and I am keeping them dry until end of January, only
misting them. As I am in the middle of constructing a greenhouse, they will be going into it in a few weeks, which will change the environment, but they all bloomed last season from late Winter to almost Summer (primulinum).
As we know, many Dendrobium (think of the nobile hybrids) let their bloom season be regulated and I see no reason why one could not do the same with this group. Most plants want to adapt and flourish, regardless of blooming in Winter or Spring-Summer. They just need the trigger, so to speak. I would not give-up, yet.
Jamie
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