If it is the Sear nose that makes contact with the hammer step, well yes if you know a very good machinest that can add some high grade material back. You would then need to temper it and case harded the nose. You would still need an original for getting the finished measurements or the mechanical drawings.

You are much better off replaceing the Sear with a new original. A Carbine Sear is not hard to find even on your side of the ocean.