Whatever flavor of MS is used, this project would be best approached with the sensors above. Some 930s have them (e.g. O2) some don't. The assumption needs to be made that if your old 930 doesn't have it, you should add it to, mitigate complexity and feature creep.
In this vein, a similar notion was discussed at length on mechanical fuel injection from pre-74 (US) cars. The viability of replacing the fuel rack with a solenoid to actuate the fuel delivery system, based on load sensing and exhaust sensors, et al, was discussed. It was considered doable using MS, but the total addressable market was too small to make a viable product, the system was very complex and the shift in the market toward originality, killed the project.
CIS seems a more likely candidate - there are more cars and more headroom for performance over stock. It is also MUCH simpler than MFI.
A solenoid actuated CIS system, with adjustments made in real time via measurements from the modern sensors used in an EFI system, would be wickedly cool and adaptable. Turbo/non-turbo CIS cars, as well as non-Porsche CIS cars would be viable from one project. There's your total addressable market.
