I heard that road trip idea from another breeder friend and I thought he was crazy at first! Then I read some other articles about how “changing the environment” slightly can stimulate feeding. In the wild they often change to a new burrow when the old one becomes soiled or otherwise scented.
A fresh newly cleaned tub with a new kind of substrate can help. I remember JKR tip about that, about giving them a new cleanly scented environment. Changing the physical location of their tub/cage even.