Your attorney can do nothing until the charges / report is filed by the officer. No one can "make" him file it.
You have no right to any tests for the charge of DUI. The law in Texas is ZERO tolerance for any person under 21 to have any alcohol in them and drive.
If you told the officer what you said here (with the time, etc.), then he was probably messing with you and has no intention of filing the charge, and it might simply go away. Otherwise, it does not sound like they can make...
Only your lawyer is in the best position to give you advice on your case because your lawyer has seen all the reports and evidence. if the case is not defensible (cannot be won at trial), then you are sort of at the mercy of the prosecutor because if the kids were under 14 and if you were intoxicated, there is no getting around that it was a felony.
Perhaps your lawyer can use your history and the loss of benefits as well as suggest some more tough conditions to add to get the DA to agree...
If you were trespass warned to stay off property (because you violated the law), then you can be kept off the property. You knew you had been told to stay off. The way to have handled it (and perhaps how to handle it now if years have passed between incidents), is to, with permission of your lawyer, figure out who makes the decisions regarding that land and write a letter of apology and explanation and ask for permission to return to the land again. (If it happened a few months ago, then...
No. Working as a special prosecutor means that on a specific case, the DA's office had a conflict and got an outside lawyer - a criminal defense lawyer - to handle the prosecution of that case. Generally that means that the DA's office respects that lawyer and the lawyer's integrity. Logically, such is more likely to have a positive impact on the judge as well. (Seemingly the DA & judge would rely more on the lawyer who they accept as a special prosecutor....)
Without some evidence of...
You can file the notice of appeal - just put the heading from your case on the document and say you want to appeal. BUT, it is best if you use a lawyer because you will not know the issues.
If you pled guilty without a motion to suppress or some other pretrial matter raised before the plea, you will have no real appeal because you waived your right to appeal. If you had a trial and were found guilty, then you should talk with your trial lawyer about your chances on appeal.
If the door to let in the prior is not opened (for example by the accused saying, "I've never been through this kind of thing" or his/her mom says, "Little Johnny would never do something like this".......), then it is not admissible. The lawyer for the accused will have prepared an objection and have a copy of the edited version ready to substitute when the prosecutor offers the damning information.
Unfortunately, there is nothing that can be done to remove this from your record. It is a final conviction that cannot be expunged nor sealed (nondisclosure.) The judge has zero say so in changing the fact of your conviction.