Very interesting post indeed. The way I see it as long as you have financial resources to live comfortably in the DR, you will be perceived as someone that is superior to others. It may seem to be a very materialistic point of view, but when you are dealing with a country were poverty is seen just around every corner, money will give you that certain status. I mean the fact is what foreigner that relocates to the Dominican Republic expects to live like the average Dominican....none.
Integration is a beautiful and worthwhile endeavor, but the human dynamic is greatly influence with what's in the bank. Some use that status altruistically others as a power tool.
What about Haitians? Are they not foreigners who relocate to the DR? Some dream of living like a poor Dominican, other based on their class and education may compete with middle-class Dominicans for jobs.
I think it's almost impossible to live in the DR without integrating to some degree, you have to participate in the economy as a producer or consumer etc. You might face barriers and you choose to associate with only certain social groups, but you are still integrated even if you live in a little expat gated community. Integration shouldn't be confused with assimilation. I think they are quite different and it takes time. Sometimes generations. You can immigrate and integrate and never assimilate. Assimilation is more about transforming identity - how you see yourself and your relation to others. You do what you have to do as an immigrant anywhere in the world. And some times you are marginalized in your native land and you find your "home" in a foreign land. For some people, it is about money, for others it's about community and others about deepening an understanding of themselves and others.
Regarding economic status and perceptions of superiority, I think you only have to present the markers of wealth without any real substance to be treated as superior.