How can I flip the dash and underscore keys in macOS Sierra? I'd like to remap dash to underscore and vice-versa in macOS Sierra. I type underscore way more frequently than dash, so this is a desirable lifehack. Karabiner doesn't work anymore in Sierra (and the Elements version is a non-starter at this stage), and I can't seem to figure out how to do it in BetterTouchTool or Keyboard Maestro. There seems to be loads of ways to remap keys for shortcuts, but flipping the primary and shift output from the same key is elusive.
Easily done  via a custom layout made with

http://scripts.sil.org/ukelele