I'd say persevere with the grid, bind it (by machine if you really don't want to put any more valuable time into it), then wash it and keep or give it as a picnic/beach/ballfield/emergency quilt in the trunk of your car.
In the trunk, you don't have to see it every day, but it's there. Perhaps you'll see a homeless person or someone in need of warmth in a crisis. Using it for that purpose would most certainly redeem it in your eyes, right?
You have been up close to it for so long, and the mistakes and aggravations are magnified to you. (I think we can all remember "that" quilt.) Let the reward be in persevering. Designate it the Most Utilitarian Quilt on the Planet and you won't shed a tear when it gets messed up.
