I looked at the performance specs for a Ninja 650R, and they compare with a Goldwing, Valkyrie or Magna. I started on a Magna and really like it. It has good and predictable throttle response, goes damned fast without catching me by surprise when I do it, and is easy to control at slower, saner speeds as well.
So you’ll probably be okay on this bike. If you check the attitude.
You’re coming off as young and cocky. My Magna is perfectly capable of killing me, except that I ride it like an old woman. That means that the Ninja 650R is also perfectly capable of killing you. If you want to ride that bike, there’s probably nothing to stop you, but if you don’t respect the machine’s power it’s not going to respect you as the rider. You’ll be off it in a tragic way.
If you’re determined to follow this course, make sure to get all the professional instruction you can. There are sport bike and stunting schools that are well worth your time and money. They’ll teach you how to get the most out of your machine.