I had a newborn chick hatch like this a while back and we used two of the circle bandaids they use for when you get shots. We put one on the bottom making sure that the toes were set the way they should be not curled and one on the top of that to keep the sticky bandaid from getting stuck to everything. She kept it on for about 4 days and it fell off naturally probably with her picking at it lol. Now her toes are much better and she is walking great.
Hope this helps.