I have a Doubleneck and this strap solved my neck dive problem.  It's a completely different solution that takes an opposite approach to the problem.  The small strap anchors your leg to the end pin.
 
http://www.catastrophelounge.com
 
I hope this post will be welcome by those who have similar issues.

Cool product. Thanks for sharing.

but how do you swing the guitar around your neck like the real rockers do?!
 

batsbrew
but how do you swing the guitar around your neck like the real rockers do?!
 

Do a Ninja kick move?
 
or.......
 
 

Proof the product works... She has no strap so dropped her guitar...

I dropped my guitar watching

I wanted to build a bass with a "guitar" Telecaster-style body.  Apparently the problem with these is that the strap connects too far from the headstock, and throws off the weight.  
This strap would work, but so would attaching something heavy to the body-end of the strap.  It's just a matter of balancing the guitar.  That leg-strap would drive me nuts.