Regardless of how one feels about the bathroom brouhaha, this is one where I feel the church should tell Iowa to FOAD, and enforce whatever rules they feel their conscience demands on their church services. Not do an end run by requiring "membership", not try and conform with the letter of the law, just say that it ain't gonna happen.
Of course the SJW's and .gov will push back, but if it's going to come down to the men with guns, then let's do it. Be the church that YouTube's a SWAT team coming in, stopping a service, and escorting a man into the woman's room. Make the SJW's hit the endgame.