There is no Lua module that provides the NMS functions. Everything is just bundled in the NSA executable. I think it could have been done in a module, but Carstein opted to create a customized Lua interpreter.
You might be able to integrate wxLua with the NSA, but I am sure that is uncharted territory. The good news is that other Lua modules have been known to work with the NSA in the past. If you make it work, let us know!
-Keith