That's a hard one. Being that something skewed, I'd be wary of just quilting it. I'd be concerned about what happens when you wash it. I've always been leary of the board quilting/noodle quilting because I can see that happening. This is the method I've used
https://www.youtube.com/watch?v=XPaIzuoY6Bg I've used it on up to a 60 x 90 quilt with no problems. It might be something to try next time.