Since there is the Taurus Protector 651(.357 magnum) or 851(.38 Special +P or not) which have the spurs sticking out but only a short distance, why not go with those instead of trying to switch parts.
The hammer is shrouded, but has enough serrated hammer sticking out to reliably thumb the hammer back if needed. Clothing will not snag on the draw from the pocket or if needed to fire through a coat.
I have a 85CH and see no reason for myself to need single action firing. On the other hand there may be instances where single action may be wanted or needed.
Here's the reasoning:
If one should have a hostage situation ( only gun you have at the time is the snubbie) or are up against a rifle toting bad guy,precision fire may be needed. Then there is reason to cock the gun, if time permits, to do so.
This has been documented in Combat Handguns, American Handgunner, and in police and tactical journals any number of times.
Mas Ayoob,Clint Smith,Al Pickles, and Chuck Taylor have written on this over the years in many periodicals about this.
Since one cannot know ahead of time what will be faced one has to be ready for that eventuality. This may seem a rare phenomena, but happens enough to warrant considering the possibility.
It would be less hassle all the way around to just get the 651 or the 851 and be done with it.
Having two snubbie revolvers is not a bad idea. If the first gun gets bagged and tagged as evidence, then that revolver is now evidence in a police station. You might get it back,after a lengthy time(it's not being maintained by police personnel i.e. cleaned and lubed) or you may never get it back.
This leaves you defenseless or in need of a CCW or house gun. Need to replace it with another. If you have two snubbies already then there is no need to worry about it.
Special need for gun, get the gun.
There is the technique of drawing the snubbie with the thumb of the gun hand slipped over the back of the hammer and acting as a shroud during the draw from the pocket or holster.
Has to be practiced but becomes second nature after a while.
I have practiced the draw mentioned above many tiimes and it works. This was with a gun with snap caps and no live ammo present.
Also did the same thing with the 85CH as far as firing through a coat pocket,snap caps again and no ammo, and could not get material to get between the hammer and frame. Why chance it though when the 651 and 851 are available