I'm sure there are many weak points in this comparison, but one I can point to is this: I have known a kohen rabbi who gave eulogies. One of the main funeral homes in his neighborhood had a special room for kohanim that was tum-a-isolated from the main funeral room, but visible in both directions via large windows and audible in both directions via microphones and speakers (similar to the small triangular building in this funeral home in Chicago).
Similarly, and with less requirement for accommodating infrastructure, user6591user6591 reported in a comment knowing a kohen rabbi who would give eulogies from outside the cemetery gates.