Extra points - in a fuel injected application - could a 2nd set of injectors be used with alcohol/water for this purpose?
Yes, and an optimal method, but the entire WI system must be resistant to corrosion, of course. All 2001+ US trucks for example, have been required to use injectors to allow high % alcohol fuels without corrosion, and so they can work well for WI or WMI. Likewise for pumps or regulators etc. I have three Ford/Denso XL5E 200cc/min injectors firing upstream in my turbo 5L project for the water content, vaporization (plus anti-puddling and even distribution), and charge cooling. They were tested for almost 3 months separately immersed in water-only, and blends of ethanol and methanol with zero issues.
As WI has been around going on 100 years, there is a ton of info and experience out there. There are many options for control today, depending on the scheme of use, timing, and percentages required, which can have substantial advantages over fixed-volume misting systems. I am currently preparing to test ratio-metric WI, which applies a % relative to the fuel being injected, and one of several control schemes available in inexpensive aftermarket EFI and WI controllers. A huge benefit to WI is that the engine is not de-tuned to avoid detonation, and full efficiency timing can be applied. A huge detriment is the hassle of maintaining liquid in the tank.
If you are after academia, I would suggest some aspirin and pulling the original NACA study reports for water injection. Attached is only one of the later reports to get a taste. Extensive and deep stuff with lots of implications. Spoiler alert - methanol in water was simply to prevent freezing in the originally-envisioned high-altitude supercharged aircraft cold environment. That said, and separate from how water alters the
combustion process far beyond delay of cylinder pressure or cooling as many assume (exhaust temperature is
hotter with WI); alcohols can provide additional octane and cooling in the intake. So, additives have different effects and purposes. Depending on your reasons and requirements, water-only, added ethanol, methanol, or others can provide specific advantages for specific issues or benefits. Have fun!