I agree this does not look like an air sac rupture. Where did the swelling start? ear lobes? or wattles? If it started with the wattles, then moved to the earlobes, that makes it even less likely that it was an air sac rupture. Do you have a pet vet for a cat or dog? Or is there one in your community? I wonder if such a vet would see him, and perhaps prescribe a broad spectrum antibiotic and a course of prednisone. If you can't go the vet route, perhaps you can use Aquarium supply antibiotics. You'll need to get advice from someone who uses meds for correct dosing. @superchemicalgirl may be able to advise. Your choice whether to wait it out vs. culling. It's a good sign that you are able to get water into him. You might want to pick up some of this.
https://www.chewy.com/kaytee-exact-...inadfAvnmPcg9zulqehoCcaIQAvD_BwE&gclsrc=aw.ds
Otherwise, continue with moistened chicken feed, and perhaps some pureed cooked eggs. Anything that is of a liquid enough consistency that he can get it down. The big concern would be that he has so much swelling that he can't swallow, or his airway gets occluded. Keep an eye on him for discoloration of his comb that would indicate apnea.
https://www.chewy.com/kaytee-exact-...inadfAvnmPcg9zulqehoCcaIQAvD_BwE&gclsrc=aw.ds
Otherwise, continue with moistened chicken feed, and perhaps some pureed cooked eggs. Anything that is of a liquid enough consistency that he can get it down. The big concern would be that he has so much swelling that he can't swallow, or his airway gets occluded. Keep an eye on him for discoloration of his comb that would indicate apnea.