Back in the dim recesses of time, I read about just that - Rodinal used as a paper developer - possibly somewhere in the "History of Rodinal".
I have no idea where to start... I don't think I'd use the concentrate full strength... that is strong stuff. My guess would be 1:10 in a tray, and watch the development closely.
Paper is not a tremendous security problem - a couple of sheets at risk is not as frightening as losing an entire roll, or expensive sheets, of film.