I'm confused how you're going to mount a stock –– any stock –– without the lower receiver extension.

With iron sights it's just as simple as closing your opposite hand eye.  In your case it's the dominate eye.  Just close it and with enough shooting you can progress to squinting, and probably eventually to both eyes open thru the iron sights.  I've always been right handed and eyed but as a young soldier I went thru my basic marksmanship training firing left handed.  I figured I might need that skill some day!  This required me to shoot with my non-dominant eye.  I qualified Expert on my first attempt so it can be done.

My left eye is clouding slightly as I age and I don't get as sharp vision thru it as I used to.  It's the non dominant eye, but if I shoot left handed and use any of my red dot sights I can see the dot and target if I keep both eyes open as these sights are intended to be used.  Works as well as it does firing right handed.  Works with my expensive Aimpoint CompM4S and my cheap SightMark clone.

–– Chuck