If the underlying stem is dying, your hand is forced. The keiki leaves are dying because the stem can't provide them enough water.
Some people cut up the old stem and leave a small piece attached to the keiki. Others carefully cut keikiis off the stem. Still others cut the whole old stem at the base, and lay it sideways on top of a tray of sphagnum moss. Whichever method you choose, high humidity around the keikiis is important.
If the keikiis are large enough and you can water them enough, they will push new growths from their bases, and the new growths should have healthy leaves. If they aren't large enough yet, they will probably die. There's no way of knowing what will happen without trying.
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