How about bringing in Hobgoblin as the villain in the 3rd film? Harry goes to see a therapist to rid himself of the "delusional" thoughts of seeing his father, and in the process sells off the technology to the character who becomes the Hobgoblin. The Goblin's presence in the news makes Harry even crazier, and he takes to the skies to defend the true name of Green Goblin. Whaddya think?