The bent ear can be straightened using steam. Woodworkers and instrument makers use steam and clamps to bend wood into desirable shapes. Gunsmith Gary can use a teapot on his stove to produce the steam to soften the ear and clamps to hold it on his rifle until it cools/dries, or use a block of wood slightly smaller then the sight mount to "over" bend the ear for a snug fit. Be forewarned.!! Steam WILL remove dirt and oil so some refinishing of the area may be required.

It's the only way I know to bend wood. Perhaps watch some videos of how instruments like violins are made to give you an idea of the process.