Be sure to post the results if this is tried. Ozone treatment is pretty common here anymore in potato storage. There is a company in Aberdeen Idaho called O3 Zone that builds ozone generators, been doing it since the mid 90's. The best results seem to come from a 2 fold application. The first is going into storage; a metal hood is mounted on top of a conveyor belt leading into the cellar. The "fog" is pumped into this hood. The second stage is after the storage is full, O3 is pumped into the ventilation system. I would think something similar would have the best chance of success with grain. Pump the ozone into the auger going into storage, and then again through the air system. While you're at it, you could try spraying a mist of hydrogen peroxide into the auger also.
This has been talked about here for grain, but the people with Ph.D's and supposedly lots of smartitudes, say that while it would kill the organism, it wouldn't help with the exudates from fusarium-DON. It was explained to me like this, if you have a pen full of cattle that needs to be completely cleaned out, it's easy to clear out the cattle, but the manure is much harder to get rid of.
I've about decided though that university researchers aren't interested in doing research that doesn't involve a big grant from a chemical company.
I worked for a large potato seed grower in the 90's. He bought a ozone generator to help with dry rot (also caused by a fusarium). In the front of one the storages was where we kept the spare tires and tubes. After being treated with ozone all winter the rubber rotted. The tubes were so brittle you could break them with your hands, and the truck tires would split trying to mount them. Expensive lesson.