While your idea is sound in theory, the SRT kit that SIG sells includes a replacement part that is a LOT different from the non SRT part. I don't think you can get there from here and you will likely make your weapon UNSAFE in the process so I'd advise against it even though I appreciate your DIY approach.I have a factory CPO 2001 P229 with legacy slide and standard trigger. When I test the trigger reset with the slide off the frame, no I don't allow the hammer to fall free, the reset is very short compared to when the pistol is together. I experimented with the trigger disconnect bar which would not make a difference. Then I experimented with firing pin block lever and I was able to change the length of reset. I'm not going to tempt it, but it seems that a slight modification would allow shorter reset without STR parts. I imagine if modified it wouldn't allow the FPB to clear the firing pin channel. Is that correct?