I have almost the exact same question, except I am using Unreal.
I made a character in Makehuman 1.2, then import that into Blender. Either from file -- or over the socket
Socket seems better because you have more parameters for the import. I made an import preset. There is an option when making the preset to "Delete" helper geometry -- this is exactly what I want. I just need the body with morphs so I can export.
The only way getting the mesh with morphs into Unreal works is if you export from Blender without applying modifiers. However, that means you get the helper geometry.
If I manually delete or separate the helper geometry, it messes up the morphs (which makes sense, as it is changing the vertex count).
When trying to import over socket with helpers deleted, however, it fails and I get a stacktrace
(
https://imgur.com/a/JMKvDzi)
This seems like what you were looking for too, maybe it would work for you. From the stacktrace it seems like when importing from MH with helpers deleted, there is a discrepancy in the vertex count (which yeah, makes sense, but that's what I'm trying to do)
I will keep fiddling with the settings.