Leopold is a Korean company, not Chinese. I don't know what you mean about Chinese Leopolds. I know they make some of their boards in China, so I might just be overthinking it.
The Gateron PBT sets are Leopold friendly, I think. Can't remember if they come with a 6x spacebar, but I know mine did.
If you can't find clears, you can always get an FC660C. I recommend you stay away from brown switches. You're better off with blacks or blues.