Just found another hidden menu / shortcut that was able to help get me my MSL/SPC code. I don't know for sure if this will work for everyone or if the Chameleon stuff only loaded after I reverted to ZV3 to try to get LTE back but it's worth a try!
Using Shortcut Master (lite) from the play store, search for "ChameleonNodeMenu". Launch it and scroll down about halfway to "DiagMSLRequest". This setting will enable or disable the phone asking for MSL when you use ##DIAG#. Just enter 0 for the value and press SET.
Now you can exit out and dial ##DIAG# and enable it without needing the MSL code.
Once it's enabled, you can connect to a pc and get your MSL with Basic Flasher as described here: http://forum.xda-developers.com/showthread.php?t=2394499
Using Shortcut Master (lite) from the play store, search for "ChameleonNodeMenu". Launch it and scroll down about halfway to "DiagMSLRequest". This setting will enable or disable the phone asking for MSL when you use ##DIAG#. Just enter 0 for the value and press SET.
Now you can exit out and dial ##DIAG# and enable it without needing the MSL code.
Once it's enabled, you can connect to a pc and get your MSL with Basic Flasher as described here: http://forum.xda-developers.com/showthread.php?t=2394499