The bark environment, being entirely different from the moss one, will require the plant to grow a new root system optimized for the new environment. That is true of ANY change.
Rather than stressing the plant twice, I would make the "big switch" all at once, following these guidelines:
1) Repot just as new roots are emerging from the base of the plant. Those new roots will be the long-term "sustainers" of the plant, and we expect the old roots to fade away.
2) Keep the plant really warm, and the bark really well-watered while it is adapting. Warmth favors quick root growth; the high moisture level will keep the older roots alive longer (that's what they are optimized for, coming from moss) while the new ones take over.
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