I did some experimenting and found that the OBJ files exported from SH3D, import into Blender (2.78b is the version I used) seemlessly. However, the scale is off.

To remedy this, select the entire model (put it on its own layer and hit the A key) then scale it down to 0.1 so it'll match Blender's environment scale (probably not the right term, but hopefully you'll know what I mean).

From there, Blender exports to various other formats and hopefully that includes the one you want.