I don't know if this has been mentioned or not, but reading several of the posts made me think of a few couples in my ward. They are great people, but they have no children. They have wanted children, but they were never blessed with any.
They are in their 40's now and they just don't think it is going to happen to them.
I have seen them in their callings and they have worked in primary and YW/YM and they treat all of the children like they are their own.
Are there any couples in your ward (or possibly stake) like that?
Also, one other thing I was thinking about. Just maybe the men are apprehensive because you are single so, you may want to make a plea in RS sometime when it's pretty full let all of the sisters know your situation. Just come straight out and let everyone know your son needs a father figure. Tell them to give you a call or email after they have thought about it.
I also hope things work out with your Bishop. Please post back when you talk to him.