He did say it was 'tight', and some of those crappy looking old beaters actually will shoot pretty good. He didn't say if he had shot it as yet, which if in decent shooting condition would be step #1. If that proves functional, then.....
The shotgun bead is not a bad notion, cheap enough done. A uni-ramp front could likely be done by himself as well (minimal tapping plus some JB weld under ramp), though getting the sight height just right is touchy. Homeboy "recrowning" (of the minimalist sort) also not that tough to try, given the gun as is apparently has no "real value", nothing much to lose.
Feed the local gunsmith, I would not, but he really has nothing to lose here by tinker & trial. Try the shotgun bead and practice some point shooting, nothing ventured, nothing gained.