Thunder storms very quickly lift particles sometimes as high as 60,000ft, and there's other phenomena such as mountain lee waves that are mixing air in excess of 120,000ft, well into the Ozone layer.
Also, if mountains do it, then why aren't there ozone holes above mountains?
The reason I ask, is because the way you are asking questions makes you look like a layperson using intuition to guess something that scientists already understand fairly well.
as an example, you posited that CFCs are dense, and thus why would they interact with the ozone layer? That is simple intuitionist thinking - but it ignores a ton of knowledge about how particles mix and disperse in the real world.