I have noticed that there are several companies that make dust covers with HK and AR style sights attached, like the one above. My eyes do better with the longer sight radius. I am faster and more precise. That is one of the things I like about some Valmets and the Galil.
The problem with iron sights mounted on the dustcover is that no matter how tight the dust cover is when you first install it, eventually it will get looser and then the sights move with each removal and re-installation.
The Valmet and the Norenco Hunter solve the problem with a little shelf at the rear of the receiver to help positively locate the dustcover. I have been puzzling on the best way to duplicate this shelf.