Some of those problems look like things that happen to me when I'm attempting FMQ on my little Bernina, and I would never, ever consider charging someone for that or even volunteering to quilt something made by someone else.
Someone in our guild had a beautiful quilt that came back from the LA-er with terrible problems. She got a couple of friends from her bee to help her take out the stitches. Sharing the work might make it a lot more bearable, as well as much faster. If you don't have any friends nearby armed with seam rippers, maybe you could find some via this board. You can search the membership list for those near you, and turn it into a getting-to-know-you social occasion, maybe treat them to a movie and/or dinner. I'd certainly be willing if I lived nearby. Good luck!