Thanks for making time to reply!
Your questions are very perceptive and important and, unfortunately, members of the Alfa BB Research and Development Committee have not had resources available to answer any of them :-(.
Truth be told, we have convinced ourselves the coil within the VSD is integral to an oscillator within the Ignition Computer (again, separate from the L-Jet computer, but connected by the TPS signal [1/0]), but have not absolutely verified the situation. As you observed via your three questions, simply hanging an actual (or electronically simulated) inductance may neglect other critical circuit components. I believe the relevant term is "unintended consequences". As you may imagine, incautious efforts to modify our IC may result in release of very expensive smoke from the unit, a situation no one wants.
As you have probably guessed, my efforts to reach out for a solution to our quandary included outreach to others and I have been in touch with members of another electronics Forum,http://www.electro-tech-online.com/automotive-electronics/132744-alfa-romeo-needs-vacuum-sensor-device.html#post1107645
after lacking patience to await your response. Additional details are on the link and I will share your observations with them.
Additionally, I will research the IC as a tiny voice is telling me there may be other particulars available.
Once again, thanks for your input and I welcome thoughts from you and members of Arduino Forum. (BTW, you folks must have achieved some degree of notoriety as iPad spell check corrected my misspelling of Arduino-just did it again :-).