I'm not a big fan of mandatory Death or Glory either. The two better alternatives, I think, are:
1. The prohibition for the pod is "move" in the active mood. The wording for tank shock is "is moved" in the passive mood. So if a tank shocking tank ends its movement on top of the pod, relocating the pod is acceptable.
2. Because the pod cannot move, then the tank must give way and if it would end its move on top of the pod then it has to stop before coming into contact with the pod.
Of course, the third alternative is to fabricate some special rules to deal with the situation of trying to ram a tank into what must be the single biggest (by volume, even it if might be mostly empty) mass of flesh on the board. It should be fairly likely that a ground vehicle would get stuck inside the pod in that sort of situation.
Fight for freedom against the undead Emporer!