This is an interesting topic, I thought of the same thing it should be a very simple solution. Only I think it would react in the same manner as if the EGR valve was just plugged off, a CEL.

The man pressure needs to be at a lower PSI then the air in the Exhaust. This allows the exhaust to displace some of the intake air. If we created a loop as you suggested the pressures would be equal and would have the same effect as blocking off the EGR. I think we still need to understand when the EGR valve opens (pressure wise). The exhaust would seem to be under a higher pressure pre-turbo then the intake since it is the side under restriction, yet this may not be the case. Differing vanes on the intake and exhaust sides could change this some what. It is not so much the speed of each impeller but the pitch of the vanes that do the pressurizing

The sensors, I would think, need to detect a pressure drop within the correct range to not throw a "CEL"