I guess Namibia is extremely dry. I'm surprised that the Phals respond so quickly. They are supposed to be CAM plants (i.e. stomata is supposed to be closed during the day). But 5-10%RH would be tough to many plant species. Lower temp, lower light intensity, less breeze will increase the drought tolerance in general.
Maybe, you can make an exhibition case (aquarium/terrarium or something) where you can keep the humidity high. Our place is also desert-like, and humidity in the winter could be around 10-20%. I can bring out the orchids (from high humidity grow tent) for a couple days to enjoy the flower, but I also thought about a small case in the living room.
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