I've seen a fair number of articles online about "The World's Most Useless Airport" (St. Helena, HLE/FHSH), which was unable to open to full commercial flights (as was the intention) due to the wind shear that occurs there. Because of this, only small aircraft are allowed to operate into St Helena.
This may well be a completely impossible idea, but if the issue is wind shear could they not adopt a system similar to this 'wind wall' which they use to protect large cargo ships in canals in the Netherlands?
Obviously we are talking about aircraft here and not ships, but would an approach like this - diffusing the wind either side of the runway threshold - have any effect on the final stage of the approach, to the extent that the wind sheer becomes tolerable for 'standard' commercial air traffic? Obviously large concrete structures wouldn't be particularly sightly, but from a purely practical point of view would something like this alleviate the issue at all?