I think LDM custom sabers is the way to go if you're looking for an accurate Luke ROTJ. You should contact him on FX (General Grievous) or trough his website: www.ldmcustomsabers.com
Marc is awesome!
However there has been at least one person that was able to communicate with Makototsai well enough to get some custom LED string blades made up that DO work with the CFLS sound board. I don't remember who that was but I'm sure xl97 will be more than happy to provide you with that information.