Its what I’ve been at the last few days, working out a feasable way to unwrap 1million+ meshes. Using Houdini and a tool developed by (UVs Last Hope) I’ve managed to get it down to around 6 minutes for an unwrapped mesh, for now using UDIMS also and so far seems to coming into UE5 fine. Next test I’ll be doing is vertex baking as a post above already mentioned, we have the vertex density now to exploit.