Best import settings for BIG MEDIUM SMALL - Post Apocalypse Collection? (Or any nonstandard skeleton)

Scaling and Rotation problems are primarily a settings issue on the modeling side. Axis Rotation can be rectified on import, but scaling issues can cause bone transform errors and incorrect physics asset generation.

Retargeting in UE5 appears to use IK rigs rather than the UE4 retarget manager. Replacing skeletons with something closer to the UE Skeleton might be desirable in that case too.