I, 95% agree with you because I just can't picture the forgers picking a Feb 1964 date. Unless, unless the forgery was done under the direction of a lawyer who would be aware that such a document would be needed at that particular time frame.
I wonder if the same document was required during the Soetoro divorce.
Hummmmm? Good point! That might be worth looking into.
You wrote-
“I wonder if the same document was required during the Soetoro divorce.”