I wouldn't do it. I know it is stainless, but there is stainless and there is stainless ...... confused! There are lots of alloys that are called Stainless Steel, but some of them can corode, or be attacked by acids. If the steel quality is poor, you might eventually get a metalic taste getting into your beers. Better safe than sorry.
You ever had a knife start to pit or get a little rust discoloration?