There seems to always be this train of thought that going to some military related school or doing ROTC in college will somehow make the candidate more appealing the next year. It doesn't. There is no check the block fix that will guarantee admission.
First, from a RC and FFR perspective, Civil Prep is a place to put those really great candidates that mathematically have little chance of gaining admission but are otherwise fully qualified. In more concrete/objective terms, they are outstanding in the leadership and physical fitness assessment pieces, and while qualified academically, they won't (even with a college bonus) likely score high enough to win a district spot.
Civil prep is not to build up leadership. In fact, chances are no college will do that for a freshman given the parameters of the West Point application. Whether they are a plebe, rat, or just freshman, they aren't going to be in a high leadership position; especially one that trumps what they were capable of earning their senior year of high school. That means that their leadership is likely to stay consistent with what they earned before.
That leaves academics - and if going to a SMC or prep school that puts lots of demands on your time and rewards you with OK grades is the result, than you may be hurting your own chances. Especially if it is one that precludes you from preparing for and retaking the standardized testing.
In this realm, a regular college with or without ROTC could be just as valuable as a SMC. Not to take anything away from a SMC or prep as they have their place, it all depends on what your goal is. If West Point admissions is yours, self sponsoring at Valley Forge may OR may not be the right route. A 30 ACT super scored might be above average for West Point, but might not cut it for your district. Do they give you the time to prepare and score better? Your MOC might like to see commitment to prep or ROTC before awarding a principal nomination that would distinguish a prep program from normal college. There are just too many variables to speak specifically about a candidate from an online/anonymous forum to make the right recommendation.
RCs have busy schedules. Responding to a candidate that is not gaining admissions this year on what to do next year is not high on their priority. Finishing out the current class, planning and conducting spring travel, recruiting 2020 and beyond, and SLE questions are the current top priority. Usually around June/July is when they will reach out and start asking candidates that were close and have a shot with college to reapply. That way they will know which applications they will roll forward for the next year.