There is almost never a reason to repair a broken tip from the edge. Always do the repair from the spine - this is free steel - the edge costs performance when adjusted.
The below picture shows a repair of a pretty decent sized broken tip. The edge was never touched, the profile of the blade remains in tact, and the blade retains it's thinness above the edge.
Since most tip breaks are VERY small you should not be able to even notice the change in blade shape like shown in the below picture. Yet another reason to leave the edge alone when repairing tips.
The below picture shows a repair of a pretty decent sized broken tip. The edge was never touched, the profile of the blade remains in tact, and the blade retains it's thinness above the edge.
Since most tip breaks are VERY small you should not be able to even notice the change in blade shape like shown in the below picture. Yet another reason to leave the edge alone when repairing tips.