I have experimented with some short tubes, Lowboy, using surgical latex tubing. The drawbacks of surgical tubing are less of an issue with a shorter run. The attraction of a short tube for me (over just a mouthpiece) is that it allows more flexibility and freedom in holding the instrument in different positions, at different angles, etc. I started out with 14″ but think a shorter length like you show there (6-7″?) is better. I avoid looking at the keyboard, but having it accessible for my peripheral vision is sometimes good.