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Interesting...
As long as the pipe isn't connected directly to the manifold it shouldn't hurt anything. I'm just wondering how much concentration of exhaust gasses you are getting. What I mean is nothing is perfect, there could be oxygen in the air you are pulling from the end of the vehicle's exhaust pipe.
OEM EGR systems typically pull exhaust gas directly from the manifold before the catalytic converter. A test I do to make sure the EGR ports aren't clogged is to actuate the EGR valve with my hand. Doing so makes the engine run really rough because of the lack of good air.
If you want to do something else you could try welding in an O2 sensor bung right up at the manifold then plumb a metal pipe to a brass ball valve then have a cable operate it? Just throwing out ideas.
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