If you are doing a non precision approach without VNAV minimums and a DA, aren't you supposed to level off at MDA? Then go missed at the MAP.
Even if LNAV-only minima are published, most airlines would still calculate and use a constant-descent profile. Dive and drive is old news.
If you arrive at the DDA and don't see anything, the missed approach is treated like an ILS missed. If for some reason you cocked up the descent rate and arrive at the DDA significantly prior to the MAP, you climb but don't turn yet.