How do you shoot pollen out of the wind?
You can't and the Agro Business is using that fact to sue folks.
What is needed is a legal attack on them. Folks who buy Heritage Seeds pay a premium for them and have them ruined by the invading pollen that destroys their ability for reseed. The big companies should be sued for damages. This isn't natural cross pollination, this is cross pollination designed exactly to ruin the Heritage Seeds. A good case for criminal intent.
I'm not particularly fond of "death by 1000 cuts" litigation, but, in this case, I'll call it self defense....they used this attack first.
Every back yard gardener should get legal assistance to file a claim. Let the "Big Guys" cough up the funds to deal with millions of them in court.