My kitten did not do well AT ALL with a cone. She wiggled and writhed all over the floor for fifteen minutes straight, and I was very worried she would rip out her stitches.
I ended up cutting a section of stretchy, 6" wide Ace bandage, sewing it into a tube, and pulling it over her tummy. She did try to pull on it a bit, but was unable to get to her incision. She left it alone 90% of the time. I made new ones and replaced them every 1-2 days.