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You're right, at very high AFRs NOx does go back down. However, most engines can't handle AFRs of much more than mid to high teens. Honda in their lean burn engines specifically use high swirl/tumble heads in order to achieve their 20+ AFRs. Without modification, a normal engine will have major problems with misfiring.
Conventional zirconia narrowband O2 sensor outputs are 0-1V, not 0-5V. I'm not sure about the titania sensors. They are different, but are rarely used. Also, the EFIE will not be accurate at the high AFRs you are wanting to run since zirconia O2 sensors only have high resolution near 14.7 AFR. Once you get outside that, they have horrible resolution. You'd have to go with a wideband system that simulates a narroband signal.
I haven't played with things enough to know if other sensors will trip you up or not. But, I have read to the effect that they may.
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