After a week of steady work and regular weighing of my yarn I have finished the additional clue that I designed, extending the design from Clue 6 to what I thought was a logical conclusion. My yarn usage calculations are spot on and I have enough, just enough, to finish the border. According to my calculations I will need a little less than 62 grams to knit the border, and I have a little more than 62 grams of yarn left. For the border, I will use half of skein 5, then switch to skein 6, then switch back to skein 5. Here is a close up of the additional clue to show the bead colors.
Pattern: Treasure Island Octagonal Shawl by Janine le Cras, converted into an Octagonal Cape by me
Yarn: The Unique Sheep Luxe in Tranquility
Needle: US 4 (3.5 mm)