Hi!
In this video I will show you how to add a custom morph target to a metahuman head in blender, so you can build your own customizable RPG character based on it. All LODs will be preserved which is important, cause built in LODs are well optimized.

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Autodesk FBX convertor (use 2013.3):
https://aps.autodesk.com/developer/ov...

Addon for shape key transferring:
https://squeezypixels.gumroad.com/l/s...

Tutorial on it:
   • How to transfer shape keys from body ...  

Script for correct LODs order:
###################################################
import bpy


objects = bpy.context.selected_objects
objects = sorted(objects, key=lambda x: int(x.name[-1]))
print(type(objects))
for object in objects:
name = object.name
object.name = name + '_outdated'
mesh_name = object.data.name
new_object = bpy.data.objects.new(name, object.data)
bpy.context.collection.objects.link(new_object)
###################################################

Timecodes:
0:00 Intro
1:00 Import Metahuman to Unreal
1:54 Prepare and export as FBX
3:39 Fixing FBX with Autodesk converter
4:11 Import to Blender
5:14 Create custom morph targets
6:09 Transfer morph targets to higher LODs
7:48 Export FBX from blender
12:53 Reimport to Unreal
14:11 Fixing materials
22:36 Fixing hair
24:56 Demonstration