Hi, Roger, and welcome to orchids! No, the Dend spike will not keiki like a
Phal, at least not in my experience. On the other hand, lots of my Dends
keiki from the canes.

When you're sure the spike is gone, just use a sterile blade or new single
edged razor blade to cut it back as far as possible without harming the
cane. Oh, and BTW, if the canes lose leaves don't automatically cut them
off. Dends will bloom on bare canes, if they are healthy ones.

HTH

Diana