I´m wondering, currently I´m doing an English short campaign (the goals of which, as you know, are to wipe out Scotland and France); however, early in the game it was... advisable to ally with the both of them, but now, about 50 turns from the end, I wonder how to go to war with them without being the obvious agressor. I´ve already managed to get Scotland to cancel the alliance with me, by making "very demanding" proposals for a couple of turns. My relations with Scotland are "abmysal", but they just won´t do the last step and attack.
France is (after a short war started by the French) again at peace with me, due to my marriage-alliance with Denmark, who are Scotlands enemies, but also allied to France. Now I need to get the French to attack me again.

I´ve noticed that unlike MTW or RTW, bribing a unit from another faction doesn´t start a war anymore, so I had to ditch that idea as well.

Since we´ve got a thousand-and-one guides how to play the diplomacy game to get peace, how about one on how to use it to go to war, without the trappings of reputation loss (or at least minimizing them)?