What would Zilean need to bring Icathia back without affecting history?

I was pondering the thought that ZIlean could NEVER be able to bring Icathia back without altering the entire timeline and essentially erasing champions we know: the darkin would never have happened, no void to the degree it is at now - and who knows what other things this would have affected.

But I was thinking, is there ANY way that Zilean could bring Icathia back somehow? I'd fucking love some sort of event, where Zilean rips open an alternate reality and it leaks into the Runeterra we know, starting with Icathia, restoring it to a state where the void never was released but is only contained to Icathia? Possibly like a sphere around the city?

I don't know, it would be pretty cool. But I doubt it will ever happen. But who knows what possibilities there are?