Earlier quoted context omitted.
As long as they accept to live under a Palestinian state. (Normally immigration should have a path to citizenship and voting rights, but both Israel and Palestine would want to preserve the national nature of their states, as Israel already does).
How many Jews live under Palestinian control at the moment?
Why would Jews want to live as the Palestinians in the West Bank or Gaza, when that means living under occupation, being subjected to Israeli military law, being powerless against settlers violence and the prepotence of Israel? And what would they do, immigrate there from New York and start a farm, with a pinky promise that they won't turn into settlers and seek to join Israel?
And of course it would be risky, when they are so easily associated with the settlers and the occupying power- no point in denying it.
Nonetheless, there are entire large Palestinian clans that claim to descend from Jews and retain some of their customs: a famous example is the Makhamra family.