The below is what i have done recently after googling and visitng various sites for ideas. Hope it will be useful for some

This is how it looks like with strap attached to kirk1 clamp to kirk camera plate. There is also a fail safe using optech loop should the carabiner break or should the kirk clamp come undone. Should the plate come undone than my handstrap will be the failsafe.

Another view

How it looks without the strap. Just unhook the carabiner and optech loop and straight it goes to the ballhead