Personally, I have never been in this situation...but have been in something close. The 8 ball was a little off center and I had a chance to cut it...but missed it. This triple bank on my personal experience, is about a 4 in 10 shot on my home table. On a bar box that I'm unfamiliar with, it is likely half that...or 20% at best.
Other options include trying to cut the 8 ball in the corner or bank it in the corner. Neil on AZBilliards suggested playing a pure safety with a halfball hit on the 8 ball as show below.
What is your opinion?