Remember that the developing times are 20% shorter with added sulfite so that 20 min becomes 16 min. With the high salt concentration there is no reason that higher developing temperatures cannot be used. Or for that matter a higher concentration say 1+49. There are lots of variations possible. Both Rodinal and sodium sulfite are cheap enough to use in a one-shot developer. I used this method years ago and it worked very well. Finer grain and beautiful prints.