I recently finished a book that might work as an inspiration to BitD. It’s Blackwing by Ed McDonald. It has pretty many things in common with BitD setting but obviously there are differences as well.
It’s a fantasy setting with firearms, although they are lower tech than in BitD. People seems to be hard bastards and there is a blasted wasteland like in BitD. There are weird cults and scheming nobles with odd way to generate electricity.
The most striking difference is that it is not about criminals but rather mercenaries.
You can find it from Kindle store so you can get a free sample in case this got you interested.
Cheers!