The first part of the following article would apply here:
Hey Scripting Guy: How Can I Move a Computer From an Unknown OU into a Known OU?
http://www.microsoft.com/technet/scriptcenter/resources/qanda/jun06/hey0623.mspx

This is vbs, but converting it to kix should not be to difficult, or at the least give it a shot, and we can help from there.