I think you're missing the point. When it comes to positioning on the approach to, and riding through a bend, you're positing for safety, stability and view through the corner. You should always be looking to give-up your position for safety. Always. So you wouldn't be riding a line through this "decapitation zone" that you're talking about IF you couldn't see that there was no oncoming traffic, or certainly any oncoming traffic that would put you in a dangerous position.
A classic mistake that a lot of riders who have either done advanced training or are trying to ride the System make is on bends that they slavishly follow the theoretical/optimum line through the bend, often and seemingly without regard for on-coming traffic. The amount of times I see bikes either on, or close to the centre line going through a left-hand bend whilst there are HGV's oncoming is a lot. You often see bikes doing this, passing oncoming HGV's on the apex of the bend, close enough to the oncoming/passing vehicle that they could touch them.