Dude,
You have two wonderful opportunities before you to serve your country through the Navy:
A) enlist as a nuke and get some great training and experience to a very cool career path; OR
B) seek a commission as a non-nuke officer and serve as such.
There really is NO "and/or" in this case. I know that it sounds like it would make sense that the Navy would appreciate you getting some deckplate level experience as a blueshirt and then make you an officer, but it really doesn't work that way. Sure, there's a possibility that you could get picked up as a non-nuke officer after several years as a nuke, but then that time being a nuke is kind of wasted. My advice is to pick one or the other and go for it [never look back], but don't plan on the mystical transition that you've proposed [it could happen, but it's the exception, not the rule]. As I've pointed out earlier, I had one MM2 working for me on the E who had good evals, qualified senior in rate, and had a B.S. in Nuclear Engineering and tried [unsuccessfully] to get picked up for OCS three years straight.
Like I said, pick one and go for it, but, if you pick nuke enlisted, don't delude yourself into thinking that you'll be anything more than just another sweaty blue shirt nuke like the kid straight out of high school right next to you. Your degree will help you in the long run, but, should you enlist, the Navy won't care about it.
Either choice is a winner, as long as you understand that the chances of you "having your cake and eating it too" are very slim. You are not a beautiful and unique snowflake.
Good luck,
mgm