I've built a deflector to send the airflow out radially, so as not to interfere with the dust skirt system.
Honestly, anything beyond that may be in vain. The number one job of the air being moved through the router is cooling the motor - anything that alters this airflow runs the risk of compromising this cooling. My deflector included.
Further, the internal fan in these routers is designed to move large amounts of air - cool the motor. They do not pull worth a damn. Additionally, IF you could harness the airflow to suck dust, you need to keep it from entering the motor area.
Good luck, I'm eager to see what you come up with!