You should be able to open a yuan-denominated checking account at Everbank as long as you’re okay with 0% interest rate.

Other than that, there’s not much you can do. Chinese currency market is under tight control by the government and opportunities for direct investment are very limited. (If it weren’t, it would’ve been much harder for them to keep the yuan so blatantly overvalued.) Even if you look at holdings of emerging market bond mutual funds – you’ll see Brazil and Russia and Venezuela and all sorts of exotic countries, but China is notably absent. I’m not sure how Everbank got around the restriction, but it clearly wasn’t easy.