Heyo, Small update - base colours are coming along and the bakes are setting a good foundation. Looooong way to go still, but happy so far. Here is the material preview in substance painter. This is diffuse only. Quick test in UE 5.2 with a rough test for the fire fx for the hair.
Heyo, I would look into that error message you get "GPU crashed or D3D device removed". Searching it brought up the issue of GPU drivers crashing with long computations, check out this entry from Adobe. I'm not an IT person, best read up yourself before you break something.