Those a called walks. We did most of our breeding on those with considerable control over parentage. It was not a southern only thing. Owners of land supporting the walks had no interest in fighting them. They could harvest some after grade birds harvested and were often payed for the grade birds. Other times they were just happy to keep pretty birds on their place.Remember what I’m talking about are free ranging homestead birds. That’s how games were often kept on Southern farms with little to no interest in fighting them. The purpose they served was to be birds that survived with little to no care. It would be doubtful the average joe would have known what a RJF was, and a RJF cross would likely have just been regarded and kept as some sort of game bantam.
My family has done for many generations what you have researched and write about hypothetically.