I'm not talking about the shovelware combat events or anything of that nature, I mean the flagship events with all their story, regions (for the GAA specifically) and other generic event gameplay
yes I know this would also require heavy client-side modding, I'm just asking how easy it would be if someone was extremely determined to, say, get the 1.6 golden apple archipelago event playable in modern versions of genshin and grasscutter
of course it will also differ for each event, the main one I care about is the golden apple archipelago from 1.6