You can do it with a script.
First, make a file called my_script.sqf *You can choose your own name if wanted.
Place this code inside the file:

params ["_unit"];

if ((side _unit == EAST) && (vehicle _unit == _unit)) then {
_unit unassignItem "NVGoggles_OPFOR";
_unit addPrimaryWeaponItem "acc_flashlight";
};

Now place this line of code into you description.ext

class Extended_Init_EventHandlers {
class Man {
init = "_this call (compile preprocessFileLineNumbers 'my_script.sqf')";
};
};

Again, if you make it with another name, change the SQF file name in the description.ext file.