I was thinking that may also be an option. All it would have to be is a voltage regulator that would take the 12 volts that feeds the heater and outputs 3.0 volts. The PCM should see 3.0 Volts as a perfect mixture. I don't know what kind of error trapping the PCM will do if it sees non-varying data from the CAT O2 Sensor.
FWIW, a LM317 Adjustable voltage regulator has a range of 1.2 to 32 volts. Output current capability is 100 mA, which should be plenty. With 12 volts in and the proper resistor divider network, it should give a range of 1.2 to 10 Volts within a .15% regulation tolerance.
The problem with all this theory is that the service manual and diagnostic manuals don't give much info about the individual sensor inputs, and it would take someone willing to experiment to see if this all works. With the stock PCMs being on backorder status, it is a gamble to see if this would actually work.
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