Stewart, why do you suspect FMV? Plumeria are well-known for splash-petals because their color genes are weak and often unstable. I have done quite a bit or research on this, have been in contact with several PhD's in Hawaii who specialize in plumeria (one is even a plant geneticist), and they say that viruses are rare and when present, will almost always be seen in leaf defects. Do the leaves of this plant look deformed or diseased?
