The way to solve this problem is, mainly, to get rid of all tariffs and import/export taxes and restrictions, and secondly to throw away the strict idea that local is always best. If organic, health-conscious considerations were applied to international food shipments, there would be no difference between a food item produced locally and one that's shipped from half way around the world. Except maybe for fresh wild fish and fresh leafy greens.
I'm not even saying all food products should be transported in this way, only those meant for consumers who want organic / healthier versions of the same food items. For those who don't care about their food possibly being X-rayed or otherwise irradiated for security or as a means of preservation, frozen or nearly frozen, and sprayed with all kinds of toxic chemicals for international transport, well then they won't care if similar things happen with local foods, and for them again it makes no difference if a food item is produced locally or not.
"Local is best" is mainly based on misguided protectionist sentiments. It used to be that everybody would regard cheese coming from France as being the best, olive oil coming from Italy as being the best, beef from Argentina as being the best, and so on. Global trade is a wonderful thing. It allows us to get the best out of what people in different regions of the world are able to produce due to their natural resources, capital, knowledge, experience and abilities. In this way you can also get a lot of seasonal fruits and vegetables all year round, because they're often in season somewhere in the world, so it's only a matter of transporting them from there to where you are when they're out of season in your area.
As for picking fruit when unripe and allowing it to ripen off the plant, I don't think there's anything inherently wrong or unnatural about that. I think it makes perfect sense. The artificial chemicals they are using only quicken the ripening process, they don't start it from scratch. If a fruit is picked so unripe that it will not be able to ripen naturally, then I don't think artificial chemicals can do anything to change that outcome. Generally fruit is picked at a point in time where the fruit has gotten all the nutrition it requires (and all it's going to get) from the mother plant, and is now just sitting there while it ripens. So it makes no difference as to the biology of the fruit whether it continues to ripen while attached to the mother plant, or if it's doing so in shipment or on your countertop.
There's a variety of organic bananas I buy that are picked (and sold) rock-hard, and are pure starch with no sweetness inside whatsoever, but within a couple of weeks they will begin to ripen, allowing you to select the perfect ripening point at which to eat them, based on your preference for starch vs sugar content.