Which actor would you want to play in Beginners Luck?

A lot of good choices!! My first choice would be the piano player, because first I always wanted to be able to play a piano(lol) but he had the perfect seat. When they show the Arizona Nightingales on the stage from the back of the theater--the piano player is center stage sitting above the audience. What a view he would have as Kitty slides out from behind the curtain and when she starts to stand up a perfect view up her dress with the stage lights illuminating. And of course seeing Kitty's dress come off with an unobstructed view.
One person you didn't suggest and my second choice would be the stagehand. You see him in the background unnoticed so he was always in the right spot to see Kitty up close and in distress/disdressed. When Spanky pushes the prop in front of mom you see his feet--watching up close as Kitty is stripped and frozen. He probably help her off stage when it was all said and done--maybe a misappropriated hand on her slip clad ass or breasts. Probably had a camera to take pictures of winning acts to advertise, so probably take a few of Kitty for personal use.