You're absolutely doing the right thing gathering information and forming your own method based on personal risk tolerance.Thanks again. Not sure if I will use one or not yet. Just wanted to throw it out there for some feedback.
For me, the odds of properly rated carabiners and rope failing are low enough that they don't justify a contingency plan.
In the words of a wise man, "A bluebird may fly out my @$$ and peck my eyes out, but I'm not wearing safety goggles."
YMMV
Forgot to add that this works for doing the Cain method of climbing also, better than wearing a riggers belt.I found this belay on MIL-SPEC MONKEY.COM but you could also just put a caribiner on your belt. The tail of your tether is there already so if it makes you more comfortable you can put a prussic rope or similar on the end and hook up.
My biggest worry has always been a razor sharp broadhead accidently slicing my tether while swinging my bow over the tether going from strong side to weak side and vice versa. I don't back up my tether but I try to use a lot of situational awareness as to where my broadhead is.