When I played Sand Hills many years ago, the Pro would handicap the card for the wind direction and recalibrate for the afternoon round based on wind change.
Handicap Stroke Allocation has nothing to do with course rating and slope and can definitely be adjusted by the handicap committee based on conditions or the form of play.
A club can have different stroke allocations for singles match play vs. four-ball stroke play for example. There is no need for a stroke allocation for individual stroke play as you just subtract the number of strokes at the end of the round (unless you are playing Stableford or the like).
The course rating system has a wind rating. I see it has changed since I was last doing a lot of rating. Before it was an adjustment based on the direction of a prevailing wind on each hole and could support multiple prevailing wind directions. Now it is just a number of points added to each nine based on the average wind speed in the summer.