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Okay, but hear me out: the failed timeline where Jayce couldn't take out Viktor + Ambessa's army is delayed somehow
Jayce is super apologetic and follows Viktor around like a lost puppy. Jayce is extra touchy-feely too and is confused as to where these feelings for his partner came from. Viktor says he can heal Jayce's leg, but complex feelings lead to "no".
He has to be held back when he finally sees Jinx, but is a little confused when he sees the little Vander clan (?) together. He also gets upset when he realizes that Viktor is dying again, but this time because he's giving too much.
He and Jinx are snarking at each other one day and they have some idea to help save Viktor and Vander. They're still super snarky but actually work really well together.
And they just manage to get their idea to work as Viktor is just managing to help Vander just as Ambessa's army shows up, but also Ekko and the Firelights show up. So most of the followers don't make it out, but the main group does.
They end up at the tree where it's a Helm's Deep moment where Vi and Cait somehow still meet up but Mel is the Gandolf here. She still faces off against her mother and sadly still wins. She's happy to see Jayce, though this makes him extra confused. And maybe they work it out between Viktor, Jayce, and Mel or maybe they have an otherwise amicable split where Mel still ends up as the Noxian leader but at least has a friend she can write to.
And maybe this is still a doomed timeline, but it's not the worst one.