[Old Dog New Trick]

I'm assuming you are trying to get them to shoot with both eyes open. Is that right?

I have always suffered LED but grew up right handed. It takes lots and lots of practice. Repetition acquiring the weapon sights with both eyes open and teaching the brain to correctly identify the weapon that is not the ghost but the one that bullets are coming out of...

In my case even after more than three decades of shooting I see two handguns on full extension. My brain can quickly identify the correct one which for a right handed, left eye dominant (LED) person is the image on the left as seen by my right eye. This can be quickly confirmed by temporarily closing my left eye. Upon opening both eyes the ghost weapon reapears and is slightly off to the right and the sights are severely angled (out of alignment), the sights I'm looking through right eye, right hand are perfectly lined up. It's become automatic for me. Sometimes when shooting offhand I just go with left eye, left hand.

With long guns the only problem (I incountered) which is quickly correctable is to not over rotate the weapon (bad cheek weld) to shoot right handed left eye. On quick (front post) shooting it's the same...I see two front sights...I use the left one.

Practice, practice, practice...don't even need bullets. Just bring the weapon into position on an aiming point, confirm correct sight picture by closing the non preferred eye and train the brain. If you are using Tritium (night) sights on the handguns this is especially useful by lowing the lights and practice aligning the correct three dot pattern, because now the shooter is going to see five or six green dots. I say five because for me sometimes the front sight of the ghost weapon lines up with the right rear of the real weapon, so there is some overlap with both eyes open. Again just close left eye quickly to confirm, then it's pretty easy to stay on sights while scanning with both eyes open.

I don't know if that helps you, but it's what works for me.