You could make a small addon included with the mission with a config.cpp something like this:
class CfgPatches
{
class johnrambo
{
units[] = {};
weapons[] = {};
worlds[] = {};
requiredVersion = 1.10;
};
};
class CfgWorlds
{
class GroupNameList
{
letters[] =
{
Johnrambo
};
};
class GroupNames
{
// note: this is array of classes
// it must not contain any non-class members
class Johnrambo
{
name = "John Rambo";
image = "a.paa";
};
};
};
just put this in a .pbo and you are ready to go.