If you're still interested, I recently wrote a Python script to convert Wolf3D maps to OBJ files: https://github.com/adambiser/wolf3d-map-to-obj
That's pretty awesome. But my main goal is bringing the geometry into DOOM.
In case you're unaware, ECWolf is a ZDoom-based Wolf3D port which might might save you the trouble of exporting to the Doom format since it reads them as-is.
