Comment 3 for bug 1392276

For the record my concern is with the suspicion that an API that's not fully exported to QML may not live up to the standards and apply changes without emitting the signals we rely on.

I'll provide a branch to expose it, and let's aim to unit test it later based on the use cases in Reminders (not to say it'll be the guinea big here, being the only user of this API for now).