Agree with all that OCS is a shock absorber for officer manpower accessions. Hopefully after you earn your degree and choose to apply, there will be a slot available for you and the DUI will be in the rear view mirror and never seen nor heard from again...
As far as a commission after enlisting, the opinions on this forum vary but this is my experience from writing many commissioning package endorsements and letters of recommendation while in command. Most of these enlisted sailors, seeking a traditional path to a commission (USNA, NROTC, OCS) were unsuccessful. Those that were successful were normally senior enlisted who were selected for LDO/CWO and were in a specific technical field (Aviation Maintenance, Shipboard Repair, Supply, etc...) where the Navy required their technical background as an officer and most importantly, had an open billet to place them in.
Why is this? Because truthfully, the Navy needs to retain the experienced Petty Officer/Chief Petty Officer (E-5-E7) more than they need a new junior officer. As you can see on this forum, their are thousands of people who are seeking a commission. Not so many with 6-8 years experience as a maintainer with a Collateral Duty Inspector (CDI) or Quality Assurance (Q/A) background, who can inspect, certify and sign off the work quality of a junior sailor. By enlisting, you have already told the Navy what your priority and personal preference is...an enlisted sailor. Not that it doesn't happen, my son's roommate is prior enlisted...but the odds are not in your favor.