I'm not able to specifically comment on the feasibility of it. I would expect that it is possible.
I would also suppose that if grain needs to be dried very fast—if it's a wet harvest year and that impacts the bottom line of the farm—then you're absolutely going to want to use the high BTUs that natural gas and eventually RNG will provide.
I'm certain that innovation could occur, but at the end of the day, if grain is wet, it needs to be dried quickly.