You could try misting the base of the keikis. It seems to work for me although maybe they were going to grow roots anyways! Using a bit of rooting hormone in the mist water might help too.
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I agree with silken, I would apply rooting hormone at the base of the Keiki, even with a q tip. They should absolutely not be removed from the mother plant. However, when the keikis are mature, they will produce roots, how long as it been? How big are they? Maybe a few pictures would help us. Keikis demand patience