Finish epoxy has little real strength - thread does, but I wouldn't trust it against abrasive (rough) edges. The purpose/function of finish epoxy is to protect the thread - that is all. In addition, it is impossible to apply real thread tension to a split ferrule - so just how much "reinforcement" could you have installed. It is most definitely better to make the repair permanent. I can assure you that if done the way described, the rod would break anywhere else prior to that same location. The biggest problem with a failed repair is that it is much harder, if not impossible, to do it the second time ... needless to say, I go full bore the first round.