You could epoxy some kind of metal tubing, (a brass bushing, or an over-sized t-nut?) to the damaged ear. You can they build up an acceptable ear to trap the tube, perhaps with washers on either side to provide a bearing surface. Once cured, you could dremel the whole thing into shape.

West system epoxies are my go to products. You can even add aluminum powder for looks. I'm thinking G-Flex might be best. Look at the "Handy Repair Pack":
WEST SYSTEM | Repair Kits