Your book sounds very interesting. You are seeking other researchers who have looked a the Italian Race Laws or other countries' race laws in the pre-war period. I have researched Danish knowledge of the persecution of the European Jews through Danish diplomtic sources 1938-1945.
Knowledge was extensive and the pre-war race laws in especially Eastern Europe are very well described in these sources. Unfortunately my work is in Danish. It is at the moment due for publication this fall. I hope I will be able to raise the money for a translation.