If this is the case, the lawyer can speak with the prosecutor before the hearing, informing that the DUI has been handled already. Then you can ask what you could do to get the violation reduced for you so that you can move forward. Usually the two lawyers will be able to come to some kind of agreement on the matter.
If you have won similar cases in the past does weight heavily on the decision of the courts. This is why having a lawyer is essential in these situations if you want to come out on top.