You could, sure. It wouldn't be trivial, even a 1-day course. Plus, nobody else would recognize the course, so it's kind of asking a lot from complete newbies.
You could just run a really tight RO/RSO monitoring procedure during the comp, to stop dangerous situations before they occur. With the right stage design and a quick safety briefing at the start of the comp, it would be pretty straightforward. I've seen it done successfully in 3-gun (no BB reqd), so why not rimfire?
For one, during safety training you do need to perform all the same operations with the same gun you'l be using for real action. So, using BB guns or airsof or rimfire to get certification to allow you to run with an AR it a moot point to me, because gun operation is different (loading, reloading, unloading, cleaning malfunctions, etc...) and people who never done it before do some scary stuff when doing all that on the timer...
For the same reason it is strongly not recommended to use borrowed gun for Black Badge course.






















































