Wear a dust mask with a .3 micron rating.... Problem solved.
Seems a lot simpler to me to stop the dust at the point it enters your body then to try stop it from being in your general environment.
The fact of the matter is you can't stop the dust from being in the room you can only remove it quicker with more expensive dust collection so why bother spend thousands on a recirculating dust collector when you can get a lot of dust out with a cheaper option and wear a mask as well.