Phal Keike Propagation

[labyrinth1959]

I have a Phal that produced two flower stems a year ago. When the flowering cycle was competed, I cut off the stems at about 10 inches in length (Photo). Both stems have now produced a Keike and one of those has produced its own flower stem and flowers. That particular Keike is now producing three roots, the longest of which is one inch long. My questions are these: At what point is it safe to remove the Keike from the stem and pot it. And, is it acceptable to use 0.25" - 0.50" Pinus Radiata bark for the potting medium? Any other advice is appreciated. Photos attached.