I don't expect anyone to have an actual answer to this, but it was something I was thinking about after the discovery of a working build of Toejam & Earl 3 on a Dreamcast dev kit recently. So surely out there somewhere there is the possibility of Dreamcast or Saturn devkits with some kind of build for Shenmue/Shenmue II... Shenmue III?
Anyway, I was curious if anyone had ever heard anything about these dev kits existing in the wild.