I think you could just pick up at the edges and knit what you want. If you decide you don't like it and take it out, there might be a bit of stretching where you had picked up the stitches, but that would just make it easier to pick up for a different edge. I think I'd pick up with the new yarn, so the 'seam' created by picking up the stitches would be a natural break.
I couldn't get the link to work for me, so I can't really see what the original looked like.
"Trust the pattern!"
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IngridKH on Ravelry