I have a half Duroc half hamp boar, every sow I catch that is open spends 2-3 weeks in the pen with him before they go! It's helped the look,the size and all that damn RUNNING! I've been using him for 4 years had a spotted Poland China I used before him, it's working for me might be something you fellas could try
This would be a perfect way to accomplish what I think this thread is aimed at. Even much better than my suggestion of buying a few domestic sows as turning them out. With your way the feral sows will stand a much better chance at living long enough and educating her young for survival in the wild. Plus only got to buy 1 pig but you do have to house and feed it. If your a land owner and want this type of pig, I'd buy sows and turn them loose since you controle the hunting but if your leasing or just have access to land and can't controle the hunting, bringing the feral sows to the domestic boar then releasing the sows back into the wild to give birth and raise her young and pass along her knowledge and skills of survival amongst hunters and the other obsticals would probably be far better than my idea.