Just adding an “into the night” “down the rabbit hole” post to claim the start of some success with the whole curve process.
This “information” that is however currently empty is correctly importing from an FBX file after modifying the FBX import IO files.
As soon as I manage to import the curves along with it, the issue of importing from ue4 to blender is resolved - though I still have no idea on how to provide this into the plugin, I might end up having to package a separate plugin to overwrite the default FBX import or run alongside it if possible.