Rotating should seem to be able to be intrinsically safe for decocking. I do worry (a bit) about the ergonomics of twisting a little thing on the back of the slide. Safely. In the dark. After a UOF incident when adrenaline is up. Etc.
Why would you be decocking the gun (only required for disassembly as far as I understand) under that scenario? Wouldnt you just reholster it like any other, standard Glock?