As so often happens, tonight I was looking for something else entirely and came across another doctoral dissertation related to Galatians. It is freely available for download here. When I found the two the other day I searched for Galatians but missed this one as it is about Gentiles.
Tae Hoon Kim, The Origin of Paul’s Concern for the Gentiles and Paul’s Gentile Mission. ThD Diss. University of the Free State, 2007.