I hate to be one to kill creative ideas with thoughts of safety but...
I have a shift kit on my bike. While in traffic I'm constantly shifting because of stop signs, traffic lights, etc. Two hands on your handlebars where you can quickly get to your clutch and brake or both are essential in my humble opinion.
I know, I know, what a buzz kill but just remember, it's easy to see what the road's going to do, impossible to predict what other drivers will do. You must be ready for the unexpected ALWAYS!