Hi, I registered just to reply to this because I was googleing this same thing, reverse keyd claviatures or whatever you call it in English, I live in Sweden and this topic could be 10 years old, Im too lazy to look it up, but I have to say:
I am right handed and has Always been.
I played guitar righthandedly for years. Then Jimi Hendrix came into my ears and I became experienced. Only people that are experienced understand what Im talking about. It means you know, by listening, why they called him the greatest guitarplayer that ever lived. You either are experienced or you're not.
Then I restrung the guitar and it made a World of difference. The guitar should be played left handedly. I dont care how it sounds. Some people even called me stupid for simply stating what I noticed after switching. This is why the guy who wrote "My sister is a lefty in does fine on the piano".
Did Hendrix do "just fine"?
Realize that your creative hemisphere Controls the left side of your body. A study showed that left handers are less prone to brain disease in elder years due to implementing both hemispheres as opposed to us rightys who mistly only use our left half of the brain, because we only use our our right side or hand of the body.
I nowadays write, draw, paint, beat the monkey (seriously), mouse (computer), grate carrots, chop, Everything I can left handedly, I will play the piano or keyboard (**** rightys) leftily, fly simulator joysticks anything I can because Ive experienced the genius of true musical authority, and the truth is, it is NOT the editor or whoever of Rolling Stone Magazine, or **** Rolling Stones themselves (that suck).
It is he who needs not be mentioned, among guitarists.
I leave you with a comparison of traditional/left handed pianos played by a master. You tell me which one is more creative. It is self explanatory.
https://www.youtube.com/watch?v=cowjrSTHKTw