I don't know if this has ever been tried for that particular situation, but I have heard of plants being tricked into flowering by bruising them. Choose a spot where the damage won't endanger the plant, a leaf-stalk near the growing tip works well. You can bend it or squeeze it, your choice, but stop as soon as you see signs of bruising.
I've seen this work on plants that
should have been flowering but weren't, and I'm testing it for use in getting day-length sensitive plants to flower outside their preferred latitude, but I have never heard of it tried with a plant that flowered too early. I have no idea if it would work. If you decide to try it, please let us know!