I would like that too, but I'm afraid that would require leet animation skills. Plus the dragon on the roost isn't the normal red dragon model, it has no hind legs, so it would require a heavy revamp of the whole model.
However, I can make the normal dragon descend upon the roost base and phase into the final building during the final moments of the birth animation, but I don't promise anything. This would also heavily increase the model file size as I have to import the whole dragon model into the roost model.