A book that I read recently had a character in it that spoke in that backward way that Yoda does in the Star Wars saga. He was an eccentric wizard who lived inside a mountain and had many quirky characteristics, but the backward speech just didn’t cut it. I think the only being in the universe that can get away with something so annoying is Yoda himself.
I could see where the author was coming from. She was trying to make him more interesting and eccentric, but it just didn’t happen. He was hard to understand and it just made him sound really dumb, when he was a really intelligent man.
My advice to any author who is contemplating this same thing: DON’T. Just don’t.