Like I said, Brom doesn't know the dynamics of the church, and he's too new to be in the inside loop. Being in Allison's camp, he also doesn't have access to members of the church that are not sympathetic with Allison's situation. Allison may or may not face a Magistratum trial. But whether she does or not will have absolutely nothing to do with Brom's proposed case, or any attempt to overload the system.
Brom had absolutely NO idea that a case had been brought against Allison, or of any of the other cases set forth. He did it all of his own accord.