Could you line breed back to the Red Jungle Fowl cock for a few generations? It would get you back closer to what might result in a self-sustaining population. That would still leave you with a population very prone to inbreeding depressing since started effectively from one bird.
I had all resources in the world, back cross to cock as many generations as I can. During that interval I would be trying to get pure Red Jungle Fowl hens, ideally wild source from near where you will be stocking your birds, that would would be bred to your cock to produce a group of birds have more genetic diversity to work with.
There will be other challenges. I have experience establishing a fish population that did take. Their is more to this than simply letting them go where you want them to be.
I had all resources in the world, back cross to cock as many generations as I can. During that interval I would be trying to get pure Red Jungle Fowl hens, ideally wild source from near where you will be stocking your birds, that would would be bred to your cock to produce a group of birds have more genetic diversity to work with.
There will be other challenges. I have experience establishing a fish population that did take. Their is more to this than simply letting them go where you want them to be.