I know there is a chance of DC releasing a new trade of this at some point considering they have released all of NML.
But I decided to collect the individual issues got it just in case they drag their feet. I've managed to I think collect the importance comics needed, just need a reading order if anyone can help;
Batman Bane of the Demon 1-4
Azrael 36-40
Catwoman 33-36
Detective Comics 697-699
Robin 31-33
Detective Comics 700-702
Shadow of the Bat 53/54
Batman 533/534
Batman: Bane One Shot (1997)
Thanks.
Edit; Actually, Azrael 36-40 leads into CATACLYSM doesn't it.