Have you ever heard someone say "White Sharia"? This is a term used by the dissident far right to describe basically something close to Islamic Sharia which would be correct on women and gays, but it has a twist in that it is also used to enforce White Nationalism. There really is nothing in Islam that would support this kind of program really so this would be an aberration of Islam, and it would not likely gain support from the wider Islamic community.
However, Noahidism is different, Noahidism actually promotes ethno-nationalism. According to Judaism, when Noah and his three sons exited the ark, the children they had amounted to 70 tribes or nations. These were the different ethnic groups of the world, each divided into their own nation. God gave each group their own distinct identity so that they could positively affect the world in a unique way. With each group giving their unique expression to human civilization, they would all work in harmony to make a better world. This is what would have happened if they had continued to follow the Noahide Laws, but they didn't/
Though the Sanhedrin over in Israel is unofficial, it is still respected and many Noahides go there to pledge their allegiance to the Sanhedrin. According to the Sanhedrin, HaShem's plan is for all of the world's ethnic groups to have their own nation, and that mass migration between nations is the plan of the secular "New World Order" (Yes, if the Rabbis admit the NWO exists so can we). While Hashem does not forbid interracial marriage, and this is a decision which is made by the individual, mass race-mixing is not HaShem's plan for humanity. He wants different ethnic groups and races to exist.
Today, especially in the west, there is increasing ethnic strife due to mass immigration. As the different races mix in America, more discontent and violence occur. While America will likely never be sorted out ethnically, Europe is actually the indigenous home to white people, and so each nation in Europe could more easily slow don't its immigration and work to increase the native population. Of course, Noahide ethnon-nationalism is not limited to white people, all races of the earth should be living in ethno-nationalism.
In Judaism, these nations are the "70 gates" by which the non-Jews enter the World To Come, 70 expressions of Noahidism which are created unique by the unique ethnic expression of the tribe from which it came. When all the tribes of the earth have their own home and their own culture, and are all Noahide, we will have peace