That’s me. I am the boss of my knitting. I snipped a thread in the left front, between the armhole shaping and the neck shaping, ripped back 10 rows, and then grafted the two pieces back together.
If I look really hard, I can tell where I did it, just above the white line.
But I think it looks pretty good! This was definitely better than ripping out the whole hood and shoulder seam.
I’ve grafted sock toes before, so I had a basic understanding of how it works. The CPH pieces were like a very big sock toe, but with 8 purl stitches amid all the stockinette. It would make sense that the purl stitches would be worked in the reverse manner of the knit stitches. If you usually start by going in as if to knit, go in as if to purl, and vice versa. Finish each stitch by doing the opposite of what you did to start. Knit goes to purl; purl goes to knit. Mind-bender! Woolly Wormhead has an excellent tutorial on stockinette, reverse stockinette, and garter stitch grafting. From there it was a small leap of faith to a knit and purl combination.
It’s so logical. I’m pretty pleased with myself for figuring it out.
If you ever have to do this, don’t forget that you can only rip down; you can’t rip up into the knitting. Choose your cut accordingly.