John,
It's either that or caps falling into the action (that "minuscule " post does a "Herculean" job!!). The notch is already there and remains the same width as it was (you retain the same footprint). Actually, the originals were much narrower than what you see today. So, de-burring the safety notch, polishing it and adding a cap post is about as close as 100% as you'll get. Unless, . . . you add an "action shield" which is a cover for the action that I developed. It mounts on the hammer (so, it's just along for the ride!)! It seals off the hammer slot and keeps any cap frags out of the action (which the hammer slot is a direct entry to). It also has a "claw" at the end that will keep presenting the debris each time you cock the action. That will allow you to turn the revolver over and dump the offending intruder!! Works perfectly!
As an aside, it pretty much mitigates any fouling ( being blown down the hammer slot) from entering the action. Keeps the Mobil 1 that I pack the frame with very clean! So much so that I think a "once a year" inspection of the action is all a SASS shooter needs as far as cleaning the action. If it looks OK, check next year!
For the casual shooter, it's a "lifetime" deal. Just clean the cylinder and barrel, wipe down the hammer and frame, yer done with cleaning chores!
Mike