Some years ago Bob Smalser made some very small bow saws to fit coping saw blades. I copied him in making a simple one that tensions the blade much better than my coping saw, providing more control on the push stroke. It works well for dovetails.
If you were cutting intricate curves, the light weight of a KC saw might be helpful in swinging the saw accurately back and forth. I donÂ’t see an advantage to the extreme light weight for dovetails.