Nice! I have an equestris that's a keiki itself, maybe 5" across, and starting to put up a spike already. It was on the parent's spike, and was just cut off a couple months ago.
I'm tempted to put keiki paste on the spike and see if I can get a keiki off this keiki.
You could use keiki paste on a dormant node of the spike, but that might just make it branch out. They almost always produce keiki naturally, I'd just wait!