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I dont know what you ate today that made you come up with all these ideas…
All I have to say is poor kid. At some point in its life, it will find out either that it has a goyish father or that it can’t marry for fear that it might marry its sibling. And thats besides from the issues it may have from growing up without a father.
I would think that a woman in her mid to late thirties would rather settle on marrying a guy who was not her ideal, than to do that to her child.
Theres gotta be a different solution to the shidduch crises. For some reason I dont think this is it