The plural of "genus" is "genera".
Your USDA growing zone has very little to do with what you can grow, as your plants will probably be indoors, and all the zone tells you is what the typical outdoor low temperature will be.
Phals are hot growers, that are somewhat tolerant of cooler temperatures; miltoniopsis are cool growers that can (in some hybrids) be tolerant of slightly warmer temperatures. That is not "similar conditions".
Plants that like it very warm and with subdued light include stuff like many bulbophyllums, and there are SO many interesting species and hybrids of those - and they tend to be fairly fast-growers - you might give them a consideration.
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