Happy new year, Mike! Awesome to have a clean OSM integration by an UE4 engine developer. If you see a way to integrate a trending repository like GitHub - reinterpretcat/utymap: Highly customizable library for procedural world generation based on real map data into your approach I am happy to do work on it! He is using heightmap data and has more rules to produce the geometry in an encapsulated C++11 core library.
I did a quick hack to load a mesh from his implementation into Unreal Engine, but keep struggling with a cleaner approach. The is to bind C++ class function to a C API. My efforts are located here: