I honestly think this is the wrong thing to do. You bring Rudy to the starting line-up, move Roy to SF - and in the 2nd unit you go with Miller, JB, Webster, Travis and Joel - and you implement a real run and gun offense. You can do it with a good defensive rebounder (Joel) and a PG that can push the tempo (Miller) playing small-ball (Travis at the 4). If there is no fastbreak opportunity, you still have one very good pick and roll player handling the ball (Miller) with a guy that can set good picks (Joel), 2 long-range shooters (Webster, Travis) and another guy that can start the pick and roll and attack the rim from the dribble (JB).
I like Howard - but I still think that Travis at the 4, especially in a fast unit (which we can do with a PG that does not turn the ball over just to please MARIS) is a bigger mismatch.