Its a wise saying "If its not broken, don't try to fix it" What’s wrong with maintaining the status quo?
So competitors watch the direction of smoke or vapour, we also look which way the string from the target is moving and the grass and tree movement. History on the target and throwing up a piece of grass or leaf in the air all help in considering wind direction and strength. I thought all these things are part of the skills we attempt to improve at that make HFT the sport it is today.
If the crutch of the problem stems from leaving behind non biodegradable material on the course then maybe some simple wording as part of the safety brief reminding competitors to respect the land we have been allowed to shoot on may be a simpler way forward.
Air Arms HFT 500
Weihrauch HW 97K