Oh, didn't pick up the scale from the photos. The roots didn't look that big, Fact is, roots are not huge relative to the plant, don't overthink the potting issue. If you just added some medium bark to those Phal pots, you'd likely be OK for the near term. And longer term, they're likeliest to be happy in baskets, hanging. But if you can't maintain them that way, as they grow just shift to larger bark as you go to larger pots.
---------- Post added at 07:58 AM ---------- Previous post was at 07:54 AM ----------
Just had a thought... in pots, consider a mix that is all or mostly inorganic - lava rock or pumice. Lots of surface area to hold moisture, but also very airy and doesn't rot.
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