I was tempted .... I did some searching ....
henekenii comes from arid regions of Dominican Republic & is often seen growing on cactus, some years the only moisture is from dew.
Sounds like it should be easy but then there were posts on a forum that indicated it's really hard to grow ... very susceptible to the slightest rot, high temps, high light (no surprises), high humidity (surprise!).
Good luck Eric - keep us posted!