You know, not quite the same, but when Keeva was ittybitty I had great success with taking a hammer to the bigger bones (I use mainly chicken frames). I didn't have to pulverize them too much, really, just mash them a little to give her a head start. I smashed the bones inside of the meat, so I would end feeding her a slightly flat drumstick, or the like.
Worked well for us and I've read of many breeders doing the same thing for litters raised on raw. It allows you to use the whole chicken frame (over how ever long your dogs take to eat it), which has a nice meat to bone ratio.