
If I go to a site and that company ships items internationally, I expect the price to be clearly displayed. With that transparency of pricing, I know that I am paying the same shipping costs as everyone else that purchases. Also without the international shipping price being in the cart, I cannot use the cart to make my potential purchase.
Not being negative, or over critical, just pointing out a significant commercial flaw with your current international shipping.
You can add a shipping cost to each item and then have an additional cost added onto it in the shipping options module.