I was actually successful at reshaping a denim rogue satchel with snake handles recently. It was stored poorly at the outlet where I got it from and the piping was all out of shape too, but at 70/10 off I decided to buy it and take a chance at reshaping it.
Stuffing it alone didn’t help for me. I took a huge risk with the method I used, but it paid off and didn’t damage or change the leather. I first fully stuffed the bag. I then used a blow dryer on low heat setting several inches away from the affected areas for about 30 seconds and then used the cool setting after. Finally, after blow drying I left the bag stuffed for a day in a cool dry place and it turned out good as new. The steaming from the shower sounds like a gentler way though, so I think I’ll try that if I ever need to reshape a bag in the future.