The guys from Modern Times did a presentation on brewing with coffee at NHC a couple of years ago, which is where I got the idea of using whole beans. Their talk is definitely worth a listen.
Anywhere I can listen to it?
NHC recordings are at https://www.homebrewersassociation.org/how-to-brew/resources/conference-seminars/. They are free to download for AHA members. The coffee session was in 2015.