NCA COMMISSIONING?
I applaud your giving consideration to such a serious change of direction. I can't speak from the NCA perspective, but you mentioned the potential for commissioning from NCA.
My experience as a flight commander and writer of many annual reports is that it is far easier to get commissioned from civvie st than it is from within the Service.
I have always considered the selection process at OASC to be as fair as possible given the limited time they have available to look at someone. Notwithstanding the efforts that go into finding out all about every applicant, it is clear that those arriving with the baggage of a few yr's worth of reports, often written by people who have no idea whatsoever what they are doing, are at a definite disadvantage.
I think it is too late for you to be commissioned as a direct entrant, so going the NCA route may be the only option for you, but I don't think it will be easy.
Whatever you decide, Good Luck!