A simple plugin for remap any keymap within Sublime 2/3 sublime-keymap files; you can just define a new keymap and the plugin will do the rest for you. The plugin also keeps the entry up to date if the context of the keymap changes.
Keymap Redefiner: Define Keymap
Keymap Redefiner: Update Keymaps
Keymap Redefiner: Remove Keymap
The extension can be found here:
github.com/Chris---/SublimeText ... -Redefiner
Enjoy the package, if you would like to help improving the plugin, please feel free to contribute on github.