Dunno if you can find them anymore, but Baretta made a PX4 that is SA, its the type C variant (c for constant action). Basically the hammer rests in a half cocked position after you chamber a round. There is no decocker or safety lever on it. However the hammer is spurless and can only be pulled back by the slide. Not sure if this is quite your cup of tea, but figured it would be something different than a sig for you to look into.