I agree that you normally should wait for new root growth, but I put some of my stressed plants that needed to grow new roots in S/H and they thrived. They needed to grow new roots, whether in s/h or in bark. I did that in summer, though, so they had some warmth and more light than this time of year.
You might want to keep them in the LECA but treat it more like bark, i.e, don't keep any (or much) in the reservoir for now, and then when they start new growth you could convert over to full s/h. You might fill up the pot, then tip it out so there is just a small amount of water, and then water more frequently as needed until they establish themselves
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