We do not need a 50% solution of either NaOH or KOH. The KOH I got from The Chemistry Store was in the flake form. Less than 100 grams per liter are needed for Rodinal. If the flakes are poured into 750 ml of water at room temperature while stirring, there is no sticking to the bottom and the heat generated does not cause boiling. Add the sulfite next. The p-aminophenol base should dissolve, and you have produced a Rodinal expedient.

Can anyone tell me the solubility of potassium 4-methyl paraminophenolate in water, or where to find it?