Well, the reason I want to do that with HP5+ is to make negatives as good with a faster film, as the ones I'm making that way with FP4+ already.

Initially, the goal was to get the edge effects and accutance of a staining developer in EMA with a product with a long shelf life that I could buy in liquid form and measure out in small quantities, on a per-use basis. I tried Pyrocat MC in glycol with FP4+ and I like the results.