I'm not looking to get into a debate about this.
Nobody is looking to debate with you. But if you calm down a little bit you might learn something.
Other than the custom offset King hammer for Smiths, hammer styles have varied quite a lot over the years with S&W revolvers.
Originally, S&W side swing revolvers had what was known as the Long Throw hammer.
I always found this early style of hammer to be less than user friendly. The knurling is relatively shallow and there is not much of a gullet between the hammer spur and the body of the hammer. Fairly easy for the thumb to slip off the hammer on a hot sweaty day.
An early style of Short Throw hammer was the so called Speed Hammer. This pair of K-38s from 1957 at top and 1950 at the bottom have Speed Hammers. It was a more ergonomic design than the old Short Throw hammer, there was a deeper gullet between the hammer spur and the body of the hammer, so it was easier to manipulate.
This photo illustrates the difference between a modern Short Throw hammer and the old Long Throw hammer. The design of a double action revolver dictates that the hammer must be pulled back farther when cocked than when the hammer is released in double action mode. That is just the nature of the design and you cannot get around that. However the engineers realized that the hammer spring was compressed enough at double action release to fire a cartridge. Any extra rotation past that point compressed the spring more than necessary. So the internal geometry of the Short Throw hammer was redesigned slightly so that the full cock position of the hammer did not rotate back quite so far as with the old Long Throw design. You can see in this photo that the Long Throw hammer is rotated back about ten or fifteen degrees more than the Short Throw hammer. The Short Throw also contributes to a faster lock time.
This photo shows the difference of the hammer shape of the old Long Throw design in the background and the modern Short Throw hammer in front. Notice how much deeper the knurling is on the Short Throw hammer. In addition, notice how deep the gullet is between the hammer spur and the body of the hammer on the Short Throw hammer. In practice, when cocking the Short Throw hammer, the tip of the thumb rolls into that gullet and the pad of the thumb never looses contact with the deep knurling. On the hottest, sweatiest day in July, my thumb is not going to slip off that hammer.
I have always felt that Colt had a leg up on hammer design with their double action revolvers over Smith and Wesson. The Army Special from the 1920s in the background of this photo has a slightly better profile than a S&W hammer of the same era. The Official Police model in the foreground is a more modern Colt design, and it too is very easy to control. Notice how deep that gullet is.
Lastly, S&W Target Hammers used to have a spur that was wider than the body of the hammer. Combat hammer spurs such as on a Model 10 were usually the same width as the rest of the hammer. This K-22 was made in 1950 and it has the typical wide hammer spur of a target hammer. Very easy to control.
Now, let's look at the geometry of the Colt SAA hammer. Part of the reason it is easy to cock is because the body of the hammer is longer than a double action hammer. Again, part of the design. It has to do with where the pivot point of the hammer is. So you have greater leverage when you pull back the single action hammer, which makes the effort seem easier. Now look at how huge that hammer spur is. It is enormous, giving the tip of the thumb plenty of space to roll down into without loosing contact with the knurling. In point of fact, the hammer spur of a Colt SAA, or any of the replicas, is so tall that it blocks your view of the sights when the hammer is down. It is a single action revolver, so why would you need to see the sights until after the hammer is cocked. You must cock the hammer in order to see the sights. I know you said you like to shoot your revolvers single action style, but I assume you will want to shoot them double action at least part of the time, and being able to see the sights usually helps improve accuracy. Ruger Blackhawks have a shorter hammer spur and you can in fact see the sights when the hammer is down. When Ruger brought out the New Vaquero one of the features was a hammer profile more like a Colt, and yup, the hammer spur blocked your vision of the sights until the hammer was cocked. Later they made a couple of different hammer styles available for the New Vaquero.
So that's it in a nutshell. If you want to design up something for a gunsmith to weld on, don't make it so tall that it blocks the sights. Think about wider, not taller. Remember that you still are working with a shorter lever arm than with a single action revolver, so you are already behind the eightball in that respect.
At one point, Marlin lever rifles came with a plastic attachment that you slid over the hammer spur so you could cock the hammer more easily if there was a scope mounted on the rifle. The attachment extended to either side, giving you more 'thumb access' in the limited space under the scope. Not too different than the legendary King hammer.
