You could almost just put a box fan on one end of your enclosure and put the vacuum with some sort of tapered thing (maybe made of foam) to guide the dust into the hose. No extra load on the x, y, or z axis and the vacuum doesn’t need to run the full time. But the major drawback would be that dust can get in places that may interfere with the functionality/accuracy of the machine. This is why it is not recommended to clean off any sort of mill/lathe with compressed air. Getting dust in the airflow of the dw660 could potentially be a fire hazard and generally just be bad for the tool.