You mentioned the World Egg Bank, so just letting you know that I believe that hasn't been very successful for people here and it's very expensive. I do know one person it's worked for but I've not heard of any others.
I agree with others that it's well worth having immune testing done. But, you'll probably need to find a FS here that actually believes in it.
I have a quick question for others here....Does anyone know if donors are tested for Cystic Fibrosis gene before donating? I'm assuming not, but obstetrician asked me about it today.