Could always put a 'meatball' on the rigs... of course, the cost might be excruciating, and of course, you'd need competency on the rigs to determine the wind (more difficult in practice than one might think) appropriate approach heading (and are you willing to leave that to the rig) and redirect the thing (with all that entails) accordingly... and operating/maintaining it (or any other rig-based aviation equipment) in the 3rd world... well, that's all I'm saying... and that's only for glideslope in visual conditions... and doesn't assist in the management of closure rate...
Shawn-
Surely something out there for hover/low speed wind info is at least as accurate as the OADS (Omnidirectional Air Data System) we had in the HH-65A.