I’ve updated my K2 Hook Up WordPress plugin to include support for two of the latest K2 Hooks: template_primary_begin and template_primary_end. You need to be running the latest version of K2 to take advantage of it, but once you are, K2 Hook Up will help you target over 10 regions in your theme with the content of your choosing – without having to edit any files. Current Users will be able to auto-update from wp-admin. New Users can get started here.
For developers looking to contribute to the plugin, K2 Hook Up is now on GitHub, so fork the project and send me a pull request with your changes.