I thought about the whole "incorporation" issue as well.
However, in the context of cooking, I know that greasing a pan prevents/limits sticking - even when you add a hot mixture into the pan - so thought it would be worth giving a shot in this context. I little extra glycerine won't hurt the soap in any event, so no harm done if the experiment flops.
Let us know how this works as I'm a huge fan of the shave stick - especially when I'm trying to shave :D a few minutes off my morning routine and when on the road.