How can I override the default action helper?

I’m tracking most actions by overriding send in Routes, Controllers, and Components, but I can’t capture direct method calls or closure actions invoked in templates in this way. I’d like to wrap the default {{action}} helper so that I can automatically track all actions, but Ember.Templates.helpers isn’t defined as I expected it to be. How can I override the default behavior for this helper?

On Ember 2.8, but upgrading to 2.12 soon.