It came to me that I had swatched this yarn a few month ago. That swatch had enough yarn in it to knit another row and a half! That would certainly help, but would it be enough?
Then I hit on the idea of weighing my remaining ball of yarn before and after one of those 500+ stitch rows.
Before: 11 grams
After: 9 grams
Assuming that the bind-off row takes a bit more than each of the other rows — which is what I have noticed in the past; when I run out of yarn during a bind-off, ripping back exactly one row doesn't give me quite enough yarn (YMMV) — and assuming that I used exactly 2 grams (scale doesn't go to tenths of a gram) I would be able to knit 8 of the remaining 11 eleven rows called for by the pattern, plus the bind-off row.
That might be satisfactory, but I thought I should at least explore the possibility of using ALL the Misti Alpaca Hand-Painted yarn and doing the bind-off in a solid color.
At left, all the solids I considered; at right, the finalists.
I am leaning toward either of the ones on the left side of the finalist photo, with a slight preference for the one at upper left.