You can script the export and import of dotXSI files to and from a Crosswalk-enabled installation of Maya.
file -op "FileFormat=0;Animation=1;Normals=0;2DTxt=1" -typ "Softimage_Crosswalk_exporter" -pr -ea "C:/tmp/test";
file -op "Update=1;UpdateMesh=1;UpdateTransform=1;UpdateMaterial=1" -typ "Softimage_Crosswalk_importer" -pr -i "C:/tmp/test.xsi";
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