Don't remember his name but a pistol competitor from Japan had trained there for quite some time before traveling to the states to compete and won his first live fire match IRRC. So if you get a good airsoft that would say training with one can be beneficial.
Yeah.. But he was shooting Open with a dot, comp, and minor ammo. I've done some practice with 22 pistols and even 22 conversions on both Glocks and 1911s, and it's just not the same. It works well for one shot and a transition, but not so much for splits.
I think you'd get just as much out of dry fire.