Best method for updating a modded Pixelmon/BoP world

I am working on a fairly large custom adventure map with a build team. As it is a modded world we're mostly sitting in 1.12.2, running Biome o Pleanty, Pixelmon Generations, World Edit, Voxel snipers, and a few commands in Magma all based in Forge. This past week one of the core mods, Pixelmon released a Beta Update and there has been chatter about updating. The main problem I am running into is that Biomes o Pleanty and Pixelmon seemed to have nuked their block ID pathing like Vanilla did circa 1.13 I have been digging into old Spiggot forum posts, and WorldEdit API documentation, and have found plausible solutions in both. The world download sits around 11,000x6,500 blocks and I would like to consult a hivemind before throwing myself hours into a my first project of this type.
My plan would be to pause the building over a (hopefully short) period of time with the builders, __, come out the other side with the map having all of the block states the same, or as close to the same as manageable. and kick the server back live for the builders, and eventually launch the map.
Obviously the ___ is the part I am struggling with approaching since most of the conversations I have seen mostly center around strictly vanilla world. I think due to the sizee of the world, doing the edit in a Singleplayer version of the world download will help with lag, and maybe cut down on time. But I don't know the best jumping off point for digging in wikis myself. So I was wondering if anyone had insight where to point me for my own research, or if anyone has experience here to help I'd be so appreciative. Thx
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