NCA gaining commissions from WSOp to WSO is, just like promotion, very competitive. You don't just decide,"I'd like to be an Officer now". You need a few years of "above average"" or "excellent" appraisals and the support of your command chain.
If you are offered a commission now, I would advise you take it, rather than some years down the line attending OASC year in, year out, in the hope of being picked up. I knew some excellent and highly promotable SNCO's who tried for years but just couldn't get their foot in the door of the Officers Mess.
You have the opportunity to do that from the start - I know what I would do.