I'm torn... Would a Ferrengi prefer a Klingon CPA, or would they always worry about an "honor killing" if the books were off? On the other hand, would a Klingon look at the tax code as a battle of wits, trying to justify exemptions and maximize profit margins to "win"?
I think that a Ferengi wouldn't want a Klingon accountant because the books would be scrupulously honest. A Klingon accountant would see honest book keeping as a point of personal honour, where the Ferengi ASSUME that the books are cooked, so long as they are the ones doing the cooking.