Interpolations and Textual Corruptions: The Blurry Lines

After the past two posts, I am now in a position to answer the question that led to this brief hiatus in my discussion of the afterlife, involving the first two chapters of the Gospel of Luke.  To refresh your memory, here is the question:

 

QUESTION:

If, in your suspicion, the original Gospel of Luke began at 3:1 and the infancy narrative found in 1:5-2:52 is a later addition, do you think that should be indicated in NT reconstructions and translations in a way similar to how Mark 16:9-20 is...