Unfortunately, random stage select is broken by the stage expansion code. If I get a chance I can make a modified common5.pac and GCT codeset that will apply just the costume expansion but will still include the 64 HD stages and the Corneria/Sector Z switch. If that's not important to you, you can take pf/system/common5.pac, menu/common, info/portrite, and pf/fighter from my build, download stock Project M, and replace the files in PM with the files you copied from my build. Then you can apply the
CBliss Tool to the PM code set (RSBE01.GCT).