The Duck describes a pistol that is perfect for the target range and nowhere else.
These are combat pistols and deserve respect for the amount of damage they can do, even accidentally. Since you are not backed up by a safety, the best trigger is the one with the heaviest pull that doesn't affect your shooting. The 3.5 connector was built for target guns, 17L, 34, 35. There was no intention on the part of the designers for that part to be used for duty, and there certainly isn't a need. The fact that no Police or military organization would allow such a mod should tell you something. It's bad enough to shoot yourself in the leg, but the bystander you shoot is going to hurt a lot more.
It's a shame people are so hung up on performance and gadgetry that they would unnecessarily sacrifice safety by putting target triggers on combat guns. That attitude scares me.