This is why the minor should have an attorney. That would have to be negotiated. It's not an unreasonable request, and I have seen courts
allow it, but they certainly can insist on their own programs which report back to the court, so that the court knows that the minor isn't cutting corners.
I can't answer what the supervision entails because that too may have to be negotiated. At best, XXXXX XXXXX be unsupervised, except he must complete the requirements I've spoken of, and, of course, stay out of trouble. Otherwise, he'll be expected to report to an assigned probation officer every now and again and follow whatever terms his probation officer may add to the basics I've mentioned above, such as not being able to leave town without permission, not hanging out with others who have criminal histories, and other things that his probation officer may deem necessary based on his background. Either way, if he gets in trouble with the law again during the pendency of the case, the dismissal goes out the window and he'll have two cases to deal with.
Having supervision is more difficult and if it has to take place in another county than where you are, it may be hard on you if he's not of driving age. The prize at the end of the rainbow, however, is a dismissal, and only an acquittal at trial
is better than a dismissal.