There are definitely 52 yay votes so it depends on Bennet & Abbas, who might support it. But the question is, what will it change?
Bibbi will for sure win, will that be enough of a ladder for Saar, Gantz, or defectors to sit with him? They could just as well do it without the special election (especially as it becomes imminent), and if that is their intention, they'll do it beforehand while their negotiating hand is stronger. On the other hand, even after Bibbi wins a special election, Saar & Gantz can't be forced to support Bibbi, and can force another round...
The main reason Bibbi is pushing for this legislation is because it will oust Gantz from his November rotation and buy Bibbi more time by closing the door on a potential Bennet/Lapid cabinet.
Why is it a sure thing that Bibi wins?
The way I see it, Likud (and Bibi) got 30 seats. That's 25%.
Yes gimmel and shas are worth 15%, but if it's not an election for actual gimmel people, many chareidim won't vote.
The anti bibi, who want him replaced, voted for gantz, lapid, Saar, meretz ect, and would come out in their same numbers just to dispose of bibi, since that's what unites them.
So if they can unite around just 1 center, or center right candidate, I can see them beating him, since many of Bibi's Natural partners, aren't exactly dying to make him win.
The anti bibi vote is much more united. They can be right or left. The only thing that matters is bye bye bibi.