Yeah there is an AI scrip that fill the silo with a nuke. However, I'm not sure it works for human players, if it does then perfect. If not, then you can try to make the computer get the nuke in the silo, then give the silo to a human player. Again I'm not sure if the nuke will transfer but it is worth a shot.
http://www.staredit.net/index.php?tutorial=55Just use the part with filling silo with nuke.