Sidelight three-prong lock mechanism

I have four of these side lights in the house. I have changed all the house hardware from brass to satin nickel. However that's not the easiest thing with this unusual knob and locking hardware for the side lights. I have pictured the installed side lights and also the individual components of the locking mechanism. My bare minimum is to replace the brass knob with satin nickel which requires precisely placed dimensions for both the holes and the square turning post, in order to continue operating the locking mechanism. My ideal outcome is also to get satin nickel door strikes. I have for sidelights with three strikes for each one a total of 12.