Hi everyone.
I'm a new forum member and new to the leather trade. I mean, I did it a very long time ago as a kid (Boy Scouts) but really haven't since.
Anyway, I was reading through this topic and was reminded of a similar topic on a youtube channel from Don Gonzales. He did one similarly over a moleskin journal/book. Although I can't say if he covers the thickness of the leather but he showed by adding a separate piece of leather for the binding, it would maybe take care of your concern?? Not sure if this speaks to your topic and please tell me if I'm way off base (I"m such a noob) but just wanted to share. In fact, I have this very idea as a project down the road when I can get better with my tooling. Right now, it's such a mess that's it's embarrassing!
Happy leather making!
JL