You could theoretically use Ripple as a way to provide liquidity on Bitstamp.
By purchasing BitstampUSD with Bitcoins or other means and then depositing these into your account.
At the moment it is not possible in large scale, but it could be worth looking into.
Just a suggestion.
Ps. Not sure if the actual liquidity it would provide is so low that it is not worth the effort but it could be worth looking into.
The liquidity is not there at the moment, but if you put in the orders in large quantities, they will be noticed. Liquidity is a chicken-egg problem and can only be solved if you actually do something against it.
Ripple is a small community which has its benefits too - if you put in a learge announcement, that you are going to make the market on Bitstamp USD and really follow up on this, anyone active in Ripple trading will know.
Anyways, the bigger issue I see is that it might be a bit hard to justify buying USD.Bitstamp with BTC - after all they want to transfer only USD, and not do trades (they could easily sell BTC on Bitstamp for more USD - the problem is that they are not theirs!). Working with a local gateway (there are 3 or 4 major Chinese Gateways offering CNY IOUs) might work though, especially if you then make the market by offering exchange rates towards Bitstamp.USD that are competitive. It might at least be worth a shot - in general either they do it behind closed doors or they are really too risk averse when it comes to trying out a few new things like trading a couple 1000 USD on Kraken or Ripple or re-opening the MtGox bridge once more for selling fiat to have more depth on that end...