Ember CLI + PhoneGapBuild Push Notifications

I'm trying to setup push notifications inside an initializer in an Ember CLI project. My initializer includes:

initialize: function(container, application) {
     var globals = container.lookup("route:application").get('globals');

     application.deferReadiness();
     document.addEventListener('deviceready', onDeviceReady, false);

     function onDeviceReady() {
           var startAppJob = setTimeout(function(){application.advanceReadiness();}, 10000),
           pushNotification = window.plugins.pushNotification;

           if ( device.platform == 'android' || device.platform == 'Android' ){
                 pushNotification.register(
                       successHandler,
                       errorHandler, 
                       {
                          "senderID":"xxx",
                          "ecb":"onNotificationGCM"
                       });
            }
    }

So far so good. Except the ecb now expects the "onNotificationGCM" function to be in the global scope. So, where should the following go?

   onNotificationGCM = function(e) {
        switch( e.event ){
          case 'registered':
            clearTimeout(startAppJob)
            application.advanceReadiness();

            if ( e.regid.length > 0 ){
                  globals.set('push_registration_id', e.regid)
                  globals.set('push_device_type', 'iandroidos')
                   console.log('registered')
            }
          break;

Declaring it with window.onNotificationGCM or this.onNotificationGCM inside the intializer doesn't work:

processMessage failed: Error: ReferenceError: onNotificationGCM is not defined

This question Cordova Pushplugin: ecb not called suggests altering the callback which in their example becomes:

"ecb":"window.GambifyApp.NotificationHandler.onNotificationGCM"

Except in Ember CLI what would this be inside an intializer? Is it even possible to access or is there a better way to implement all this in Ember CLI?

Thanks in advance for any help!