For those of you who don't know what Karabiner is, it's software that let's you customize just about everything about how your keyboard works. I use it so that 'caps lock' is actually control, but that if I tap it it works as escape (among other tweaks). I think anyone running OSX should be using it.
Anyway, the developer is fantastic for listening to suggestions, and not only did he add colemak support, but he's also added tarmak!
https://github.com/tekezo/Karabiner/iss … -154707061
You'll need to run a beta build (which I've never had trouble with), but now it's super easy to switch through on OSX.
Enjoy!