Drdawg, by what I'm reading in your post, it's a miracle there are any fiddle-leaf fig plants, at all! I hope the wasp that pollinates it's elusive flowers doesn't do so exclusively, or it will easily become extinct, -as would ficus grown from seedlings. I thank you for the information on fiddle-leaf fig plants, I've always admired them, as houseplants (tree-lets, actually), mainly in the lobbies and foyers of banks, and businesses, and occasionally, in indoor conservatories or libraries of friends.
According to Richard and Mary Eggenberger's book, (The handbook on Plumeria Culture, p.52) plumeria can be air-layered, but I imagine to duplicate their experiences with this, one would have to duplicate their climatatic conditions as well, whereever they were when they propagated plumeria by that method. Might be hard to do that, if they air-layered them in India....