| Hello snowball and welcome to the forum.
The most important thing with orchid culture is always to give the plant the culture/conditions it likes. So with a Cattleya for example, they like to be watered then allowed to dry out (as you probably know). It is possible to give this to them whether potted in a plastic or clay pot, while mounted, or even in a basket. A friend of mine has a Cattleya maxima that she grows in a basket.
If you try basket culture wiht a Cattleya, I'd recommend you still use potting mix, probably the same you are currently using essentially just substituting a basket for the pot. You'll notice there's quite a difference between Vanda and Cattleya roots. In the wild Vandas grow with their roots hanging in the air but Cattleyas grow wrapping their roots around branches so while Vandas do well in baskets with no mix (or even on hangers with no basket at all) Cattleyas do better with some kind of medium for their roots to grow in and around.
I'd also recommend you try it with only one plant first until you figure out how you'll need to adjust your watering. Because a basket is more open than a pot I suspect you will have to water more often.
Keep us posted on yoru progress and what you decide to do!
Happy Growing!
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