Update: About a day or two after I put the clear bandaid splint on, I noticed that it had fallen off. And the chick's toe was straight and normal! Now all of its toes look normal, and it's running around being a little chick without problems and, importantly, without being bullied. The adoptive mom is taking great care of it and its sibling. I have another broody with chicks of the same age, and the two families were separated at first, but yesterday I brought them together and they are getting along really well. Each set of babies still goes under their own mom to sleep or warm up, but other than that, both hens feed and mother all of the babies. So the story really has a happy ending, despite the earlier setbacks.
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It's the one on the right, last to go under the hen: