What you are practicing is an excellent idea.
Shoot just one innocent person and it's all over.
Target identification is a must.
Practicing one handed shooting is authentic to how they did it back in Earp's day, and a very good idea in its own right.
You might try your drills with the other hand occupied with luggage, a malfunction long gun, gesturing and pointing, opening a door, 'etc.
Also add yakking and talking to the drills.
It's difficult to talk and shoot at the same time.
It's encouraging to read a post about increasing skills, instead of just what gun or caliber to buy.
Lock the doors, they're coming in the windows.