This doesn't quite answer your question, but the attached snap is a test on Ilford Warmtone. Looks like it was overexposed by a third stop, bleached as stated, (from home made formula), but was re-developed in Moersch not the Fotospeed. It works to an extent, but was not quite as subtle as I wanted. It was a relatively normal contrast on the original print so maybe if it had been a grade or two softer might have been better. I also don't think the photo suits the process though was a reject shot from a shoot. Far prefer the main one as does the subject!
www.mike-crawford.co.uk
I think I also did tests at the same time on Ilford Classic, which also worked, though presume as I took a picture of this one to send to a friend, this must have been the most successful. I certainly got good results in the past using Ilford Multigrade IV. I'm back at work on Monday so will see if I can find the tests on Classic next week, though can't promise I still have them!!