Just an copinion but I think they need liaisons from each militia group to be appointed that can meet with the police units so that their intentions are known, what their specific actions or lawful citizen function will be and iground rules can be set. From a distance at first lest they get arrested. Probably need an escort to keep an arrest from occuring. Probably get the best results using Intelligent level headed persons with former LEO or military background
Calling up the unorganized militia has at least these benefits:
a larger force at a lower cost to the state
coordinated action - more effective & greater safety (friendly fire)
indemnification