If TIG'ed and filed to shape, the trigger guard will undoubtedly need to be polished, maybe need to have some engraving picked-up, and re colored (blue or black). The success of this restoration is totally dependent on craftsmanship.
Whether to restock or repair and let good enough alone depends on your sense of aesthetics and your use of the gun. You can have the stock repaired and shoot for awhile before deciding about a restock.
Handling. Have you worked out your prefered stock dimensions and handling numbers (weight, balance, and swing efforts). If not, you might want to go on hold until you can confirm that this gun is a candidate for stock fit and handling that will suit you. The influence of the 26" bbls on handling can be compensated for to some extent. Post back if you care to discuss this further.
DDA