Trigger via Alexa Motion Sensor

Does anyone know of a way or have they tried interfacing motion sensors that directly and only communicate to Alexa, such as their Echo Flex PIR Addon sensor, to be used as a trigger for a flow?

I thought up a roundabout way using the alexa remote2 nodes, where a motion detected with a routine would trigger that device to say something and likewise a no motion detected would say something else. This allows the activity to be picked up by the On Device Activity trigger node in remote2, then I go from there to do the normal motion lighting logic. But I was hoping/wondering if there was a more direct approach since my current approach has about an additional half second delay versus just Alexa routines.