Doubt you'll be able to talk to a Dekalb County solicitor but doesn't hurt to try, in most cities/counties in Georgia now it's up to the officer to change the mph anyways. Try to contact the officer, tell him he caught you speeding and since it's your first one ask if he'll put it down to over 24mph or less. He has nothing to gain by getting your license suspended...just be straight up with him and offer to take a defensive driving course, knock off 3 or 4 mph and they still get their money and you get to keep your license.

If that doesn't work then you can plea nolo contendere once every 5 years, still have to pay the fine but you don't get any points added thus keeping the license...it's up to the judges discretion to accept the plea though and normally on a relatively non-excessive offense they will.