Sorry, their conversion is their only hope for salvation.
Zech. 12:10-14, Romans 11:10-12 They will if you believe what the Word of God teaches and not tradition.
That’s called replacement theology.
However, no matter,they are God’s chosen people and God has not left them out of his plans.
Yes, there is no redemption with out salvation in Jesus Christ, but God is still working out his plans for Jewish people , the world, and Christians.