Do you simply want to retrieve the delivery end points from AF and create your own Notification service? Notifications (2016 R2 or later) are only triggered off of Event Frames.
You can find information on how to programmatically retrieve AF Contacts and Delivery End Points here: https://techsupport.osisoft.com/Documentation/PI-AF-SDK/Html/T_OSIsoft_AF_Notification_AFNotificationContactTemplate.htm
Out of curiosity, why don't you want to use the Analysis Service and Event Frames as your triggering mechanism?
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You want to trigger without an event frame generating analysis? Or without creating an AFEventFrame object at all?
You can trigger a notification by creating AFEventFrames that match the criteria of the notification rule with the primary referenced element. I described that in a blog post here.
If you mean without creating an AFEventFrame object, then that's not supported.