The transportation cost i think will not make this business viable if its only wine.
What maybe i can do its add another products that you may have expensive in your country and maybe its much less expensive here and with great quality... so the cost of shippment its splited among wine and the other products.
As exemple of products Portugal also have with great quality and maybe not common its Olive Oil, our great quality olive oil start rounds 4/L and top quality (extracted at less temperature) goes 5/L, also the olives are good and can survive the shippment.
We also have good traduction in coffee but that i think price should be more or less equal arround europe/world.
If you can think in products that are expensive in your contrys and you would like to buy aswell, share, that probably can lower the cost transportating and end with prices/quality ration lowers than in your contry, making this idea a nice and profitable one.

Cheers