Conversion of usx files to ut2 file format

It does not seem possible to directly convert Unreal .usx (meshes) files to .ut2 (map) files. However, using the UnrealEd map editor you may be able to use graphics elements when designing new maps. Seems like the only way how to achieve this conversion, although it appears to be more of a workflow.

Open USX file    Open UT2 file