I noticed in your post that you stated there were no keikis to be had on these plants - somewhat odd as they keiki so freely! I have several of these and, under house culture, they tend to send a lot of aerial roots out, so I just cut them below a couple of aerial roots and repot them - they take off pretty well.
If the clump you are looking at don't have such roots, I would think about air-layering them. You can do this pretty easily with a clump of wet moss wrapped around the stem where there is a root node showing and then wrap the entire clump with plastic wrap; secure the wrap to the stem above and below the moss with string or tape and wait a few weeks - they should send out roots. You can google "air layering" to have a better description of this method - most likely Youtube has a video of such!
Or just take a cutting. Be sure you cut a long enough stem off - maybe 10 inches or so BELOW the bloom stalk. You have to have several leaves to be able to get the cutting to survive - remove any leaves that are going to be below the rooting medium as they will rot and set the stage for infection.
Use a some rooting hormone, with either the air-layering or cutting method - the roots should be easy to draw out of the stem - just be sure not to keep the medium too wet, maybe just
misting the cutting daily and let the medium almost dry out between watering.
Hope this helps! Best of luck!
Steve
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