AHHHHHHHHHH, in that case your idea is great.... here is a suggestion that has nothing to do with the question you asked (just an idea for a different type of stage). Since you are supposed to find cover (if possible) and then engage, we could have "cover" something like a large box, or wall (blue trap), you could start the time, have someone run to cover, draw and then engage.... just a suggestion...
Like
3 targets, 1 box each at 15, 10, and 7 yards. Your choice of target but freestyle from box a, strong hand only from box b, and weak hand only from box c. 6 shots on each target, 5 for snubby.
Like