After looking at some of the finished shawls, I decided to block the edge with a smooth scalloped edge.
Using Rowan Felted Tweed. Swatch on size 9 gives me 4 sts/inch before blocking in St. St.
Second ball of yarn started about halfway through clue #3.
Third ball of yarn started halfway through clue #4.
I worked the smaller version, and it used exactly three balls of yarn! I still had my swatch to unravel if I needed to, but that wasn’t necessary.