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I would think that would have been the easier route in the first place too
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After looking at the schematics I'm not sure it is going to be easier. Mapping the relationship between the EGR transducer signal and the MAF voltage should not be too bad.
I did learn more about the EGR mapping:
The exhaust gases are recirculated in line with the map stored in the IFI control module (N3/7) as soon as the following criteria are met:
* Coolant temperature between 60 °C and 110 °C
* Battery voltage 11 - 14 V
* Engine speed < 3000 rpm
* Fuel rack travel < 9 mm
I had it backwards - your posted circuit makes sense now.