The Yalkut is here.
Hagar might be considered "convert", either before Yaakov was born or afterwards - especially if you take the Midrash that says that Ktura is Hagar as a simple fact.
About Shifra anf Puah, sometimes Midrashim have conflicts, so it's not much of a big deal.
I agree, assuming that they were converts raises questions, since they have ...
The remains of Noah's ark can be seen on "the mountains of Urartu", some 18 miles south of Mt. Ararat (Ataturk University confirmed the authenticity of the ark remains in 1986).
Needless to say that the discovery is portrayed as a hoax and all the evidence is explained away (we wouldn't expect differently, would we).