I think you need to study the trajectory of the wake vortexes; They tend to drop 100ft quite quickly, then level off and not change their height thereafter.
So if anything, a headwind would blow the turbulence horizontally nearer the following aircraft, during the initial drop.
The 'straight' part of the vortex trail will however be parallel to the 3deg glide slope, and will be blown backwards away from the actual glideslope by the headwind.
However because of the low angle of the glideslope (where tan 3 only = 0.05), the amount that the turbulence moves away for a 90 second spacing and a 10kt headwind is only 78ft.... maybe better than nothing though.