Lots of folks may not know this, but before the big turkey broadhead trend, a well-respected guy (Dick Turpin) in Nebraska Game and Parks Commission who also has helped with NBEP if I'm not mistaken...anyway, he promoted using hard rubber blunts for head shots on turkeys and got it legalized. At first many, including myself, pooh-poohed this idea. Eventually a large number of Nebraskans did just that. The result, either a dead bird or an unhurt bird. This has been perhaps 15-20 years ago, and I assume blunts are still legal.
The head/neck of a turkey in full strut are actually relatively steady, and when in the strut position probably not much smaller than the actual vital of the bird.
I still aim for the body just above where the legs join it. I know Nebraska is supposed to be turkey paradise, but I don't have that many where I specifically hunt. If I did have tons (and thus tons of opportunities) I know I'd try the head shot, but probably with a broadhead.