The classic Edwal developers are really Edwal 12 and Edwal Super 20. Don (DF Cardwell) has been investigating Edwal 12 and plans to reveal his findings quite soon.

These PPD developers are super fine grain with excellent tonality and sharpness (acutance), but they are now a neglected field.

It's worth noting though that Ilford produced a Phenidone Glycin developer, the proportions appear to be quite similar to Edwal 10 with the obvious swapping of the Metol for Phenidone, I have a formulae but it's un-numbered although quite possibly the basis for the original Ilfosol.