I found help socializing my undersocialized foster rabbits that were socialized to just one person. I called a local university that trains vet techs. They took in one of my fosters and assigned two students to socializehim to people. They will also use him in the classroom to practice exams. They will take more rabbits for fall semester. Maybe this will give them the extra help they need to get adopted.
That is great! It's nice to hear that veterinary schools are teaching that kind of thing. Usually all you hear about is rabbits for experiment etc. Im glad this is working out for you both!