If you're going to mix in solvents like sulfite to soften the grain then it's not Rodinal any more
At one time when films were coarser grained than now it was fairly common practice to use them with added sulfite. Besides Agfa Rodinal another example would be Edwal FG-7 which recommended this practice. I don't think the people at Agfa or Edwal would have accepted your statement that their developer became something else. There was a time when I used Rodinal-sulfite, as it was called, quite frequently. I really liked the tonality it gave to my negatives.
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