They say a picture is worth a thousand words...
Here are the original screw pictures I posted at the start of this thread:
I patina-ed one of my new Tom Carter replacement screws, using his recommended vinegar method, and then installed it in place if the original with the broken head. Here's how it turned out, along with a comparison to the original:
Original screw:
New patina-ed Tom Carter replacement screw:
I believe the pictures say it all!