Since I have limitted vista experience and we dont use local accounts... I will offer a suggestion. Since removing the profile after it is imaged lets you use those accounts, why not delete them from the image itself. GSS 2.0 lets you modify NTFS volumes so you shouldnt even have to make a new image rather use ghostexplorer to delete it in a test copy image and then try it out.
Otherwise I suspect someone from symantec will have to help you with this one.