The Lawnmower snake is doing just fine.
As for the kink, it does look like there was some nerve damage but not as bad as I had originally thought. It's tough to judge, though, as most snakes movements look very unnatural on carpeted flooring. And since it's too cold to let him outside now, I'll wait until the spring and let him crawl around on the grass to see if I think he's well enough to be let out on his own.
He ate a big juicy worm about 10 days ago so I'm set to feed him again soon. Still haven't ordered those worms, though.