After playing around in max payne's game files, and getting help from 2 guys (H-G, sokajoru) who were the reason that allowed me to figure out all this, I managed to turn the "Love Hurts" chapter into a new and fun experience. Vinnie is now alive and ready to assist Max throughout the chapter. This makes Max, Mona, and Vinnie, the last 3 standing in Vlad's way.
I am still hoping to find ways to add new npcs'enemies, but in the mean time, I can only manipulate existing ones on the map. Hopefully, I can find a way in the future.
I also have the map available here to download: