Mer there are metal buckles you can get that fit well on paracord weave bracelets. They're heavy duty so they'd hold most dogs well. They wouldn't be quick release though.
If you want to try a roller buckle style or the shackle style I would be more than happy to put one on Knox and do some agitation/schutzhund stuff. He hits the end of the leash pretty hard. A 1.5 wide weave or 2 in would be awesome for that.