I have a list of about 5 substitutes for phenazine that can be used in dye bleach solutions if you wish. I don't know which one is used currently. I have searched for my old Ilford formulas, but cannot find them. I must have thrown them out.
One caution is this. Low contrast black and white developers often do not give low contrast by lowering the amount of silver, they do it by changing the form of the silver image so that it appears low in contrast. However, dye bleach works on the quantity of silver formed not the way it appears to the human eye, so this can fool you when you are playing with low contrast developers.