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Have you considered the proportion of the exhaust gas that is steam? Altering the EGR flow rate by intercepting the signal or using a stand alone PWM controller would surely be easier than doing what you are now.
If you want to isolate the effect of steam from also adding in CO2 and N2O with exhaust gas, then using the EGR valve with an external source of steam (better than adding steam to the exhaust gas) still seems more sensible than jumping straight into replacing it with another system entirely.
Re. "supercharging" and liquid phase injection of LPG, maybe look for information on steam ejectors for insight on how that might work. The fluids and temperatures are different but the principle is the same.
Among other applications, steam ejectors have been used in air conditioning systems where a ready source of steam is available. One example was in passenger carriages on railway trains with steam driven engines.
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