I recall hearing something about this when one of the waves of police surplus .380’s surfaced from Europe... but can’t find squat now. My google-fu is failing me. Though beretta never made a factory D spring for these, I suspect replacing the hammer spring with something else would have the same effect we get on the 92 series guns.
And $210 beretta 81’s are here now. Would make a nice bridge from .22 to centerfire for the uninitiated and/or recoil averse.