As a merchant shipping man, I would just comment that:
1. Keeping the RMS "St Helena" going for several more years would not be particularly difficult, though a big refit and ideally a re-engining (she has Mirrlees Blackstone engines) would be desirable. This is not too hard to do.
2. From the wind point of view, St Helena is in the trade wind belt, so the wind itself, although not the wind shear, is fairly predictable, and will be somewhat lighter around dawn.