After a rather long time, I have finally managed to get absolutely everything working when importing from Blender to Unreal. Noteworthy is something like the eternal Smoothing Group issue, which in fact is something really simple to fix: https://answers.unrealengine/questions/116748/import-tree-failing.html
Question: I’d like to assist in improving the Wiki page @
https://wiki.unrealengine/Static_Mesh_from_Blender
with multiple edits, tips and tricks. Is any one monitoring this thread able to let me in and edit the page?