I don’t think that righteous gentiles should encourage Jews to make Aliyah.
I know hundreds of Jews who did move to Israel, but then fled to either the US or Canada. Thus except for Satmars, the rest of Jews would move to Israel, if the situation there was not as tragic as it is today.
I think righteous gentiles should provide international support to the Jews to throw Arabs out and as far from the Land of Israel as possible.
I promise you, on the next day that Arabs are out of Israel, 1/3 of all Jews in Diaspora will be home.
On the next day after Israel becomes a truly Jewish state, another 1/3 will come.
And, finally, on the day that Israel becomes energy-independent 99% of Jews will be home.