The setup you've got on the left and the discussion about hockey tape got me to do something similar-ish with my LG-405s. I've had a pair for awhile and just never found anything they really "worked" with because of how small front-to-back a J-frame with no padding is.
Started with some closed cell foam to fill in the "gap"on top so I could get a higher grip like with the stock VZs. Then added strips of foam and layers of hockey tape. Still snappy with .32 magnum HSDs but much more do-able with those 405s.