Looks good. another way to handle the problem is
1. rotary cut the binding off.
2. With one seam, add a new border to the front and a batting strip and additional backing to the back.
3. press.
4. Trim if needed.
5. add a new binding.
My way (which I have done for similar reasons) is a lot more work and not necessarily any better. DH, who is my person quilt cop, sorta insisted.