That is a beauty! Has a warm and snuggly look :) Great job!
Do you have any embroidery stitches? I can still use my walking foot on my machine with embroidery stitches - have done a few quilts where I use a variety of the fancy stitches - sometimes just inside a seam, sometimes right on a seam (the stitches are wide enough that this really stabilizes everything), sometimes down the middle of a strip.
So my suggestion would be to use a honey/caramel thread as suggested, do a few different fancy stitches down and across each row. Another line either in the middle or just on the outside of the narrow border.
Have fun!