Granted, it can be seen as line drawing." 

What meaning does "Let no man put asunder" have OTHER than line drawing.  That's the question.  It cannot reasonably be done.  The immediate paraphrase --- can you think of an alternative? --- is "No man shall put asunder . . ."  From where comes a contrary meaning, either to the original or the paraphrase?  You say line-drawing is Pharasaic.  But here it's Jesus himself who's drawing the line.  Surely it isn't Pharasaic to follow a commandment that Jesus told us to follow.  "If you love me, keep my commandments."  If you want to be saved, "keep my commandments."  
You're headed in a certain direction alright, and you seem to think the farther away from following "lines," the better. That's not what Jesus taught. Ask yourself why he condemned the Pharisees, keeping in mind, "If you love me, keep my commandments." Granting that some line-drawing may "hinder metanoia," disregarding lines drawn by Jesus himself is sheer disobedience.