I am not an expert on Krag sights especially for the Norwegian ones. The idea of putting a sight on something that can move a little seems dicey to me. Maybe they work better than one would expect by returning to the same spot each time when cocked.
  If a more rigid sight like the no drills will fit your Krag I do not know. If you search this forum Butler's Rangers has posted many photos of this type of sight with photos of the modified screw necessary to mount it. The carbine that Carbon Outlaw just posted photos of may have this sight.   (You need to Login
All that said I have seen a couple of photos of the bolt mounted sights, not sure if the fit the Norwegian or how hard they are to find.
I know every one here will like to see photos and progress reports as you work on yours.