Can you equip the scepter in the tool slot? You could equip the trident or the scepter in your missile slot, I'm sure someone did try that already though.
Next on my list to try (in exploration mode) is to complete the volcano quest and make sure there is a dormant volcano next to the entrance of the CoC. Then I will kill Andor Drakon in the Nihilist fashion and teleport back to the surface, with the Heart of Ancardia equipped. All with the slim hope that this will allow me to survive on the surface just long enough to enter the Ultimate Dungeon. In 17 turns it should be possible to teleport next to the ultimate balor, kill him, grab the scroll of omnipotence and read it.
Most likely I will just die on the surface, but who knows. Becoming omnipotent just as the world is ending and the gods have died would be cool, right?
edit: Yep, died on the surface.