A good idea in theory.
But I've heard Israel is very racist, with different types of Jews discriminating against each other, with Ashkenazis being regarded as "the best Jews". They're not afraid to openly call black people "monkeys". There's been a lot of Israelis acting violently towards people they just suspect of being Arab, even if they're not. The general consensus among Israelis is that Arabs are genuinely subhuman, and I doubt they will think any more highly of blacks than they do of Arabs. Israel is also an expensive country to live in, and I think the Israeli government would just resort to killing/sterilizing homeless black populations, rather than giving them free gibs, like the West. I can't imagine Israeli employers will be employing black people either. And the Israeli public will probably have no problem with getting rid of them, because they already kill Arabs all the time.