Report:
I replaced the newly created "musicbeelibrary.mbl" file in the new instance of MB with the backup. The radio stations were present, and a few of them were quickly confirmed to work. No glitches. Proceeded to export the radio stations xml file, directly followed by importing it into the old instance of MB. The radio stations are not present after this. MB restarted. Stations still not present. Whole process repeated afresh, without any luck.