"B AA" If that carbine could tell it's story. Wow. I haven't seen the modification you talk about, but have heard of it. You should post a picture. It seems like a good idea.
I agree it is a much more natural pointer than an AR or AK. I have owned many of both through the years, but never did feel any were as natural as my Carbine. You are probably right about bore access in relation to sight height. Like a shot gun, the carbine lends itself to point shooting just looking across the top down the barrel. On a man sized target at 25 meters, shooting this way you would most certainly hit. My Saiga AK isn't to bad at point shooting, but no where near as easy as the carbine.