Be sure to post back here whenever you find out the solutions for this particular workflow as well as other forums. I'm sure that the main reason you found little help is because most of the people that frequent Mapcore are not familiar with SketchUp, Blender or FreeCAD, and where unable to provide any good feedback other then "switch to max". I'm sure its not because of some quabble with you.
But then, you stating that you are against piracy in the way you did does make you sound kinda snobby towards all the rest of us, rampart pirates and criminals, if you catch my drift ![]()