Hard to say....NR works in mysterious ways...
In my time as an instructor at a prototype, I did see students returned to the pipeline, re-inserted back into training at the point they were removed. These were the students who had been picked up for ROTC, had gone off to some college just long enough to forget what NPS had taught them, and for some reason (poor academics, usually) dropped from the ROTC program. By NR standards, they were expected to remember everything, but, of course, they didn't. It was very difficult to bring them back up to speed before they were so far behind they were dropped due to poor performance.
As you've been away from Nuke Land for just a short time, you're probably OK. The real question for NR is your motivation. A lot of people went through a lot of hoops to get you to the Naval Trade School. Regardless of your reasons for wanting back into the pipeline, NR will question your motivation to complete the training and be a productive sailor in the fleet, high gpa notwithstanding.
I happen to have a good friend who is the Plant Master Chief at one of the MTS's in Charleston. E-mail me your name (to preserve your privacy on this site) and I can ask about your status.
ETC(SS) Wilson