I tried your version to see if i can merge it to my official release of the bridge, and i could not get it to work at all, whereas my version works (not with multiple meshes, that was a limitation of my implementation.
I'm able to send my object from Maya over to Rizom, but when I try to "GetfromRizomUV" I get an error message that states "# Error: ValueError: file <maya console> line 45: No object matches name: ODRIZUV3:testSphere"
The object I'm exporting is named "testSphere"
The weird thing is, when I do "automatic roundtrip" that seems to work fine. I'm not sure what I'm missing. I do have the object selected when I click "GetfromRizomUV"
Any help would be appreciated. If I get this working I'll throw you a $10 donation on your page.