If you pop off the motor cover between the moonroof and the back window, then remove the motor assembly, you should be able to grab the shaft and turn it manually. I've used vice-grips to help index the glass position vs. the motor, just be careful to not mangle the gear.
Note that the windows, trunk release and moonroof are all on the same circuit breaker, cavity #1 in the fuse box under the dash, so if they work the moonroof should too.