The keys on these models are prone to breakage because of the 2 "hooks" at the bottom of the key. Also a Dvorak user I have been popping off my keycaps on every MacBook I get since 2008. I'm a developer in SF, change jobs alot, so thats about 5 MacBooks lol... anyway we always popped those off from the bottom corner-ish area. DONT do that to here, come at these from the TOP, if you get the 2 top clamps to pop off, gently pull the key upwards - you'll be good.. Be ultra careful not to grab the butterfly too. These butterfly's have to be attached into the button (it's siliconed to the mb). If you break one like I did you gotta take the whole assembly out, put the new butterfly "into" the button (there are 4 indents where it attaches under the button) then silicon the button (with butterfly attached) back to the mb BEFORE you can snap the key back on.
I say this from my TB13 with 6 broken keys. I'm looking for replacements right now. lol.