Hi and welcome LamineBean!
For your problem, well, I think getting the English version ain't really a big problem. You can DL it anytime you want (take the trial version on the offical website) or ask somebody here living in Beijing to lend you the cds.
I think that then, the biggest problem is convincing the WangBa managers to change 1 of their computer Chinese WoW into English WoW. I'm sure this is pretty much doable... Do you have good convincing skills??? Or money??? Or just don't say anything, install it ( not a problem at all) and book your sit for the next few months
Otherwise I would suggest you to buy a computer, it's a good investment in China, you can even ask them to install it in English.
Or play in Chinese in a WangBa next to a Chinese player that speaks English and plays WoW too
... They are more than you think!
But do you play CS in Chinese or English?
And appart from that, where are you from? and if you play with us, what character would you like to play??