Today was the day I decided to fix it. To create the back strips you use a provisional cast on at the center and knit out in both directions. To fix my boo boo, I started by unpicking one of the ends from the center so that I had two sets of live stitches.
I rotated the sides until there was no longer a mobius in the middle of my back. Then I kitchner-ed the live stitches back together.
All in all, it took about an hour. Not as much lost time as if I had to frog back to my original incorrect join. I completed the right sleeve today and have just started the left. Currently my fronts are on holders because I don’t like the original shaping of the front and I’m brainstorming how to fix it. Suggestions?