I've got a document that lists all the half wave potentials of a massive variety of colour developers (and their mehtod of synthesis), if I can find where I put it I could share some of the data so you could at least substitution potential with other available developer agents.

Add a similar amount of sodium or potassium carbonate, then set the correct pH if needed. When fiddling around with recipes, I found a large amount of base vs a lesser amount of base helps form an image faster, even if the lesser amount is well buffered, and still more than could be neutralised by the film, even at the same pH.