Thank you to all who responded to my post yesterday on teaching my son to deal with his cross dominance. In addition to the comments on this blog, the topic came up last night on Twitter, and I received many first hand accounts.
Fortunately my son was still up at the time, and we talked about the comments. Everyone who commented told me they had learned (or were learning) to shoot long guns to match their eye dominance - in other words, even though they were right handed, since they were left eye dominant they taught themselves to shoot left handed. Most admitted it took them some time, about a month it seemed, to get comfortable with it.
So, he agreed to do a lot of dry fire, with his airsoft AR. He also plans to start dry firing his airsoft Glock right handed, so he can get better with it, too. He told me his goal is to be an ambidextrous shooter, which would definitely pay him back in the future.
I'll keep you posted.