Hi VJ, you ask, “What is the best way to approach and deal with protestant churches?”
May I suggest, you make an appointment to speak with each pastor one on one, not as a representive of the Catholic Church, but simply as a person who is concerned about abortion.
Some churches maybe so anti-catholic that they do not want to be viewed as obeying the catholic church.
Some churches believe in a seperation of church and state, and thus would opt out.
Some churches are simply over scheduled, and can not fit anything new into their schedule.
Some churches need a year’s notice.
Some churches are anti-ecumentical movement because they see that as comprise with liberals.
I have found that a person who is concerned about something has more influnce then a representive of an ecumentical movement.
Plan ahead about a year, and touch base one on one with those pastors.