I have no experience at all with vanilla planifolia, but I believe all you need to do is keep going as you are with your cuttings placed across the damp sphagnum moss and guide the roots into the moss as they continue to grow. This will train them to be in a medium, and then you can eventually plant them out in pots of sphagnum, or perhaps change the medium at that point.
Happy for anyone with more experience to step in, but if you're getting new aerial roots it seems you're already on the right track!
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