What do you mean by a "baffle plate"? Perhaps a reinforcing plate at those weak points. These cracks are not on the door but on the front faceplate just outside of the angle iron that the door seals against.sounds like you're on the right track though. were it cast, much more problematic
you might post before & after repair images, good luck
also, after repair, (sounds very tacky) but wonder if you could tack a baffle plate on the door interior to help avert future issues?