generate modded structures/biomes on existing world

Is there any way to generate biomes and structures onto existing worlds? cant create a getfixedboi seed with my mod collection and cant figure out which mod is breaking world creation since logs just have the normal "generating gem structures" as last message before it crashes/gets closed. so is there a way for that? or do i need to "world edit" the modded stuff into a vanilla getfixedboi world?

https://steamcommunity.com/sharedfiles/filedetails/?id=3050294334
this is the mod collection used. have tried disabling near all mods and cant find which one causes the problem/crashes
Steam Workshop: tModLoader. suppossed to be for friends only but sadly wont work that way
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