Ken I believe it's too soon to expect growth on your plants, grafted or otherwise. Many plumeria here are still fast asleep, others however are just about to bloom. So I would give it another month before declaring them failed.
The seedpods start to turn dull and develop a distinct crack along the top when they get ready to release the seeds. Some pods here have opened, and others will do so a little later, depending on when they were formed.
