My Italian, or is it Latin, isn’t so hot but here’s an article on the relationship of Galatians 3:8b and Genesis 12:3b. Maybe someone can read it and let us know what it’s about or provide a link to an abstract.
Innocenzo Cardellini, “‘In te saranno benedette tutte le genti’ (Galati 3,8b – Genesi 12,3b).” Lateranum. 75:3 (2009): 589-596. [“‘In you all nations will be blessed’ (Galatians 3:8b – Genesis 12:3b)]