I had read the link. If those are the stamped steel nuts that I am thinking of, I remain skeptical.
But I have been wrong before, I'm sure I will be wrong again!
Ha, I was under the impression you just wanted a simple solution to bolt the printed handle to the tailgate so you could open and close it. If you plan to put a strap on it and use it for a recovery point then printing slightly over size threads on the stud then running a die nut after the fact might be a better option with a small flange nut,
Metric Jetnut, All Metal Locknut - Pegasus Auto Racing Supplies