Why not just export from maya directly into a .x file and then load that directly into Blitz3d? I don't know if that format supports IK or anything, but I'm sure you can use maya itself to convert an IK animation to other types before you export.
Here's a .x file exporter that works pretty well:
http://www.highend3d.com/files/dl.3d?group=mayaplugins&file_loc=DirectX7Exporter-v0.0-.zip&file_id=2262
Here's a .x file exporter that works pretty well:
http://www.highend3d.com/files/dl.3d?group=mayaplugins&file_loc=DirectX7Exporter-v0.0-.zip&file_id=2262