To actually go through with ctb is an incredibly brave act as far as I am concerned. It takes a lot of courage to finally go through with it.
Some methods take a lot of commitment and courage to go through with compared to others. For me, this is one of those methods. You are far more courageous than what I am. There are some ways I would never contemplate, purely from a fear perspective. I could never do it this way, or drowning, jumping and probably not even hanging.
To answer your question though, wouldn't your hands being cable tied behind your back seem suspicious for this method if the aim is to ensure your insurance paid out. I don't know a lot about the topic, I don't get off that way, but I wondered instantly, if the object was sexual gratification, why have your hands cable tied behind your back? You still have to be "pleasuring" yourself at the same time don't you?
Excuse my ignorance if this method vs outcome makes sense to others, maybe I'm too old, I just don't think the method and one of the desired outcomes (Insurance payout), match up.