I did post somewhere as alternate the formula with substitution of equimolecular weights of the potassium salts. Potassium sulfite is so much more soluble than the sodium that relatively more can be dissolved. I don't know if that is very significant seeing that the working solution has so little sulfite.
I made some of my Rodinal Expedient a year or so ago and it has not turned the strong color. I don't remember what I might have done differently, but the latest batch is quite dark. It all seems to work the same.
Just about to post in the Formula section with mention of both your formula