Expose functions in need?

Hi all, 
       I am asking if luabind can expose functions when the lua script file really needs?
Now I have 500+ functions, but not every lua file need all the functions, mostly, each lua file
will only call a few (< 10) of them. 
      My luabind module is like this:
    luabind::module(L)
    [ 
       luabind:class_<MyClass>("MyClass")
       .def(luabind:constructor<>())
       .def("Func1", &MyClass:Func1)
       .def("Func2", &MyClass:Func2)
        ...
        ...
  
       .def("Func500", &MyClass:Func500)
    ];
My Application has about 2000 lua files, each one owns a seperate lua_State. Before load the lua file, I will register the module above to each lua_State. Now the problem is that it seems kinda a waste registering 500 functions for 
each lua_State. Is there any way to just register functions needed indeed? 
 
Regards
Albin

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