Poking around in the archives I found a post in which Sandy King posted times for FP4 in pyrocat to produce negative density of 1.6, which is not far from what I am looking for. I quote it here for anyone who might be interested:

"[W]hen shooting for a DR of 1.6 I need the following times wiht the 2;2:100 dilution oif Pyrocat-HD at 70F.

SBR 10 5:00 minutes
SBR 9 6:30 minutes
SBR 8 9:15 minutes
SBR 7 11:00 minutes
SBR 6 14:00 minutes
SBR 5 19:00 minutes

These are the times I use with FP4+ for kallitype and palladium negatives. I am really surprised that you need a negative with this much density range for AZ0. I wonder if this isthe experience of other AZO printers?

Sandy"