Looking for Pachmayr or similar grip with hammer shroud.

If I'm not mistaken...

Bianchi also made a grip like the one you are describing. You might check with some of the police supply houses. Lots of old Bianchi stuff hanging around in mine. I will look next time I am there.

CDNN had some in their last catalog.

Yes, CDNN does, and for very attractive prices. Pachmayr made the grips exclusively for Bianchi International. The trouble is they were only made for the S&W K-frame/Round Butt.

Why not the J-frame? Because S&W was offering models with shrouded or inclosed hammers. Neither Bianchi or Pachmayr thought there was a market in this size. However at the time a lot of police officers were carrying K-frame snubbies.

This doesn't do much to help Q.B.G.'s problem. The only thing I can suggest is to (1) subsitute a hammer intended for the model 638, which is more "snag resistant" even though it isn't shrouded, or (2) trade your present gun in on a 638 - but your pictures suggest that you have that covered now. Last but not least, I don't know how you are carrying your present revolvers, but if the hammer spur is exposed be sure that the holster covers it so clothing won't be abraded.

(Edited to add). I understand what you are saying about the lock. I would suggest that you look for an earlier Smith & Wesson or Taurus that doesn't have this feature (if such is allowed in California). I have a Taurus that has the lock in the hammer, and while I don't particularly care for it I've learned to live with it. My personal Smith & Wesson's are "lock-free."