Well, the other widely debated issue is whether or not an illusory Miracle can work at all anyway. The idea is that the effect of casting Miracle might merely request aid from elsewhere, and then the rest of its effects are actions from elsewhere, not the player. If that is true, then faking the effects of the Miracle spell would just be faking the call and not the response. I'm not sure if that's how it works, but as a DM I would rule that way anyway as a cheese preventative.