@drdawg...interesting about the ficus. I have a F. Benjamina tree I started from a cutting about 20 years ago, that I rooted in water, in spite of it having latex. Does the fiddle-leaf ficus not root well in water? Also, have you successfully air-layered plumeria, yet? If so, with what degree of difficulty, (in your opinion) and with what amount of time involved, before the graft "took"?
I am curious, because I always like to try the simplest methods first. So, with plumeria, I suppose that would be, first:
Growing rooted plants from seed.
Rooting cuttings.
Grafting cuttings to root-stock.
Air-layering, maybe.
(Tissue culture isn't likely, on my part).