That fore sight looks remarkably like a Mauser sight to me. Getting it back to standard spec will cost a lot of time and effort, and it still won't be "original". Why not keep it as is and use it as a hunting piece, as you originally intended. If you fit a scope it should cure the High/Left syndrome. There are a number of no gunsmithing scope mounts out there. If it shoots half way resonably what more can you ask of a hunter. Then, with the money you save NOT buying bits, you can buy an original original Lee Enfield.
Then you can enjoy yourself twice as much.
Buzzard