Oh sure… But basically you’re burning the boats. Everyone you know is dead, now you either integrate or die. There’s no going back, only forward

I’m not saying it would be seamless or wouldn’t cause issues, but humans naturally readjust to the people around them. Assuming they got some support integrating, their values and habits would quickly move towards the average. And the average for us is a huge range depending on culture, subculture, and even online microcultures