Sig M17 cocking lever/charging handle

I have done some research but some things that are doable are not always commonly done or documented so I’m asking here. The M17 is double action only. What I am wondering is if there is a lever or some sort of device that will cock the hammer, effectively converting it to single action. I would prefer, if anyone knows that such a thing exists that will work on the M17, that it not interfere with the natural design of the gun and the double action when disengaged.