[Peter666]

You can train yourself to be right eye dominant. I did so by putting scotch tape over the left lens of my glasses. This was recommended to me by German target shooters and is done by some top notch IPSC shooters as well.

It is much easier to do this then to learn to shoot from your non-dominant hand.

But if you are shooting in a self defence situation, this is not even a consideration because your body will naturally react in the best way it thinks possible. I doubt many "weaver" or "isosceles" shooters have undergone much stress induced training. To learn to fight well, you MUST do this. If possible, a simple technique is to do as many pushups as fast as you can and then immediately fire into the target. This gives a bit of the blood pressure experience you will face in a life and death situation. Your main concern will be to just keep the gun from bobbing up and down while firing the trigger.