Obviously not a S&W trained "armorer"..... as such, they would never remove a factory installed safety feature. That was drilled into our heads from day one.
The dash number of the frame doesn't matter, but you will need a hammer block
specific to the N frame, as there are some minor size differences among the frame sizes you mentioned.
Absolutely no reason to remove a properly fit hammer block, as they are one of the safety mechanisms built in to the gun, and do not in any way negatively affect the action. There are some liability issues connected with this action as well. While the hammer block is not the "primary" internal safety of the revolver, there is a critical reason it's in there. Removal or alteration of a factory installed safety is never a good idea.
Here are the J through N frame hammer blocks.......
