I used the bandaid thing on one of my home hatched d'uccles, and it did work! I wish you luck, it helped that I checked the chick twice a day and made sure it took a drink each time. But I had to clean all the food off that stuck to its bottom until it was strong enough to stand up and hop with the splints. So it gradually went from sitting on its bottom constantly to standing and jumping with both feet. After about 3 days it was standing up all the time when it wasn't sleeping. And then it was like that scene in Forrest Gump when his leg braces fall off (except I cheated and snipped the middle of the bandaid first to see if chickie would do okay), and it stood and walked around for a while so I went ahead and removed the rest of the bandaid. Unfortunately, with the feather footed ones, that was NOT easy!
But the hopping and stuff sounds like my chick 'hoppy' who I had to rehome because she couldn't maneuver well i the pine shavings after she was bigger, she basically flopped to her food and water. She did better in a wire cage with wire flooring that she didn't slip on so much. She was born that way with a contractured leg which hampered her because it would get hooked around things. I still miss her. She was going to be my lap chicken, but I couldn't keep her in the house d/t the pine shaving mess. I would have bought her a chicken diaper if I hadn't found a home for her. Good luck!