Everyone always thinks "exclusive" literally means it will forever be impossible to see it branch out, when it comes to consumer markets. You know, like how the console FF games were "exclusive" to the system(s) they originally released for... oh look, officially released PC versions. It takes time, and in some cases will take years (like full games), but it's merely an example that "exclusive" does not always mean what people think it means. Given how (apparently) SE aren't the ones who decide on the exclusives for China and Korea, but are the ones who own the license, they could always bring it over if they feel the need to. If there is enough demand, they'll look into it. Doesn't mean we'll get those exact goods, but it does mean something LIKE it is a real possibility.
Besides that, aren't those items going to be in their cash shop? Which would probably mean if we got something like it, it'd also be cash shop. Oh how the evangelist types here love to cry out that the sky is falling everytime something is added to the cash shop that they want. Even if it were added in-game but slightly varied in color, people would complain and say it's bullshit that they didn't get the exact version. The outcries for vanity is really funny to see these days. Precious snowflakes that only want what they don't have. Not everyone is like that, obviously, but many are.
Don't get me wrong though, I'm all for having it eventually become available everywhere (or some form of it), but it always starts in the direction of anger or negativity, even when they (probably) aren't directly linked to what goes on in the other versions of the game. It's never something like "These <insert region> items look great! Would love to get something like that someday." to show interest, but rather it always begins like some kind of lecture or frothing at the mouth anger. This topic for example, is like lecturing the devs... wow.
The reason they ask for feedback is because they want to measure the interest for a given item. That way, they don't have to waste time and money likely negotiating with their foreign contracting companies to copy those "exclusive" items. That's right, even though they own the IP, it's not uncommon to still have to go through talks with their contract companies to do things. The final word is SE's, but it doesn't change professional (international) business practices... don't want to be that bully that takes things that were likely detailed as "exclusive" for a period of time. Particularly when it deals with the consumers as well. Some items, no matter how much demand there is for it, won't see an outside release. If they do however, it's likely LONG after the fact. Entitlement attitudes will only get you so far before the one in charge puts their foot down and tells you "no!".