I've found that there seem to be more/different suppliers on 1688.com compared to alibaba. But 1688.com seems almost impossible to navigate for someone that only speaks english. My usual method is to try to find an email address on one of their pages, and email them in english, but many times the emails bounce. 1688 also has what appears to be a nice chat feature, but being written in Flash, the google translate feature of chrome doesn't seem to work for it.
Anyway, Is there someone here in the forums that would like a small side job helping me search for a one particular component and contact the manufacturers to get quotes?
My Manncorp/Autotronik mc385 came with that same barb, and I made the same determination that it was the "Asian" type you described.
Looking at the typical places, like mcmaster, I couldn't find a matching quick connect, so I ended up removing the connector at the machine. Luckily, that threading was a standard NPT (3/4" if I remember), so I was able to make it match the rest of the shop.
On another topic, when I looked up specs on 8 and 10mm polyurethane hose like the clear in one of the previous photos, it appeared to be rated 150 - 175 psi working pressure and 450 psi burst, so it's probably fine for most applications like this.