simple headless script

init.sqf

_spawnUnits={
	//regularspawnmethod
	[]execVM "spawnviaScript.sqf";
	True
};
//check if HC1 is present
HC1Present = if (isNil "HC1") then { False } else { True };

//spawn units on HC1 if present
if(HC1Present && isMultiplayer) then {
	if(!isServer && !hasInterface) then {
		[] call _spawnUnits;
	};
}
// otherwise spawn units on the server
else{
	if (isServer) then {
		[] call _spawnUnits;
	};
};

movetoheadless.sqf

[
  {
    {
      if (count (units _x select {isPlayer _x}) == 0) then {
        _x setGroupOwner owner HC1;
      };
    }forEach allGroups;
  },
  30,
  []
] call CBA_fnc_addPerFrameHandler;

needs to be run from init.sqf after checking for HC1