At this point I think you'll just want to get the uppercase assembly. Replacing the keyboard alone is a bit tricky if you haven't done it before and getting the correct one for your system from eBay can be tough.
The Late 2011 modes are highly sought after so its worth fixing even if you don't plan to keep it.
Here's the needed part: [product|IF162-024] from IFIXIT and here's the IFIXIT guide you'll need to follow to put it in: [guide|3439]