If you're going to use a lanyard, get one from a drug rep or some other health organisation. They pretty much all have a quick release plastic clip which allows the lanyard to disconnect from your neck if pulled quickly. They are designed so that psychiatrists, psychologists, mental health nurses and other health care workers don't get strangled to death with their lanyard by a psychotic patient (or someone just sick of waiting to be seen in emergency
).
I've had one now in both a health setting (for ID, keycard etc) and as my ASIC lanyard for about seven years and it's never come loose when I didn't want it to, but always come loose when I wanted it to.