Pick a spot on the wall, snap the rifle up again and again until the sights are aligned and on the spot when the gun comes up.
Look at the spot, close your eyes, bring the gun up, open your eyes. On target? Do it all enough and just looking at something will seal its fate.
Grab a rifle and dry fire quickly on yard Deer, rabbits, spot on a tree trunk, leaf, center of a car wheel, etc. Come real time you should be fine.
. I like your idea though.. 
