If I wrote DBS, I would have Merged Zamasu ragequit from being bodied by Veggetto and absorb the Time Ring to start degenerating/evolving into Infinite Zamasu over time. As with how Veggetto defused in the manga in Boo's body (Due to the dark aura in Boo's body), the dark energy Infinite Zamasu starts emanating defuses Veggetto. Infinite Zamasu starts merging with reality. Future Trunks defeats Infinite Zamasu with his spirit sword slashing it at the heavens cleansing time and space from Infinite Zamasu, thus his universe isn't poof'd by Zen'o.
I just have to find a way to bring the second Zen'o to the main timeline now.