If you're fine with current ending, than simply don't play the DLC with a new ending? Seems like a simple solution to me, everyone wins.

Or you can just play games remotely on you smartphone from your PC. http://www.youtube.com/watch?v=zRiK0UltlYU Granted quality and FPS is low, but it is a "DIY" type of deal.

I don't own either console (PC FTW), but PS3 graphics looks a little sharper and have smother lines. P.S. this game and any other would look better on PC :P