I think he might be able to. Though unlike Doom, who is a properly educated, inventor, the Fixer is, as I've heard him accuratly described, a "cobbler". He cobbles together existing technologies, be it advanced terrestrial tech, alien, pan-dimensional, or just everyday stuff, and twists it in new ways. It might take him awhile, but eventually he'd be able to get past Dr. Doom's stuff. Simply because it presents a problem, and Norbie has made a living out of Fixing problems.