They lost their identity but saved their lives. The Druze, over one thousand years ago, went to Lebanon at more or less the same time the Jews went to Poland. They didn't go to ghettoes, didn't try to coexist side by side with the general population, but enclosed themselves in mountain strongholds and became successful farmers, merchants, warriors. They knew how to keep the money bag in one hand and the sword or gun in the other. And being only ten percent of the general population, they gained respect and power.
Force is the ultimate response for survival in the Darwinian universe.
Today, unfortunate Yugoslavia is a blatant example. Martin Gilbert's book is an interesting piece of information. You mention specific punitive taxation that left excellent records. It still doesn't give a count of the Jewish population, only of individual merchants, nothing about the size of their families of course.