That damn smiley key was driving me insane, so I got the Gingerbread keyboard source from AOSP, got it to compile, and got rid of the smiley face button. Other than that, it's identical to the stock Android gingerbread keyboard, so requires 2.3+. Eventually I may figure out how to make it able to be turned on and off, but that would rather defeat the point. Enjoy!
(Note: you have to enable it in the Keyboard settings before you can use it, just like any other keyboard.)
The Eclipse project (source) is available here