Phalaenopsis keiki on dying spike

[aliceinwl]

I’ve been putting any green spikes I remove from my Phalaenopsis in water. A few have tried to make keikis below the waterline, but these have always rotted in short order. I have one, however, that initiated a keiki further up the spike above the water.

The keiki has two leaves about an inch long each that are still at the soft supple stage, and no sign of roots. The spike it’s growing off of is now browning. I’m assuming it’s still getting some water via wicking. I’m going to be out of town for awhile. I’m wondering if I should leave it as is (dead spike in water with the keiki coming off the top), if I should move or to an ICU type set-up within a closed container with some damp sphagnum, or try to rig something where the spike will still be in water and also have some damp moss around the base of the keiki?

Has anyone had success getting a rootless Phal keiki, not attached to the parent plant/any source of reserves, established?