This one is getting back-burnered for awhile as my driveline parts, glow plugs and such have arrived, especially as the EDS is currently working with the EGR installed. Going to get the car back on its wheels and driving, first.

However I'll update when I make some progress.

Dieselbenz, that was the other simpler idea I considered, using the EGR signal to pull down MAF with a diode/resistor etc. As MAF is the only way for it to know the EGR did anything. I didn't find any records of it, so figured it would be easier to re-engineer from scratch than to fool around with different values in the hopes that it would work. Is this a documented fix?