I'm doubting that S&W will hear this one. The amount of weight difference between the two would be in the weeds. A 4" model 66 is likely as close as your going to get. Now a scandium model with those characteristics might fly but the sad truth is that K frames in general seem to draw little interest from S&W these days.
Meanwhile, you could get a 4" 617" and enjoy it's outstanding "K frame" feel.

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Dave