For (1) yes I would expect Israel could carry what it needed into Saudi Arabia in multiple trips if necessary before jumping on Iran
For (2) Saudi Arabia has jet fighters, but not the capacity to wipe out all Iran’s nuke operations. It would need Israel’s help.
I would be surprised if Saudi or any Muslim country ever would provide war materiel of any variety, and especially advanced weapons systems, to Israel to dispose of Iran. Iraq is also Shi’ite and it shares a border with Iran.