I've run servers both FTB and before, and I believe that it is absolutely imperative long-term that consistent and universal Block IDs be used between all FTB Mod Packs. Therefore, I am decidedly on the side of a good, honest, long-term fix so that this very incident doesn't occur again in the future. I'll be able to sell a one-time world restart to my players a heck of a lot easier than a series of interruptions and custom 'quick fixes' as this continues.
Also, Slow, Thanks for your candor about the issue.