In your opinion, what exactly was Schaeffers worldview in terms of the civil magistrate?
I'm not exactly sure what you asking in that Schaeffer's worldview was the same in terms of the civil magistrate as it was on every thing else. A worldview is a collection of presuppositions one uses to filter and interpret reality. They don't change from subject to subject. If you are asking what Schaeffer believed regarding the proper relationship between a Christian and the government, then that's exactly the subject of his book "A Christian Manifesto" - all 138 pages. A bit long to post here. If you want his detailed, very worked-out answer to just that question then read the book.