Just pop off the sunroof panel and push the up on the front of it and close it with your hands. I have my headliner stripped out and removed the sunroof motor and cable (stripped motor gear) and just open and close the sunroof myself. Its temporary but it works. My guess is that if the nut in the trunk wont open or close the sunroof you have a stripped gear too.

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1963 Ford F100 - Cummins Swap?
1985 Mercedes 300SD - 210K
1992 Ford Festiva - 92K
2001 Ninja 250 - 8K