export several objects into mdd

Hi, i want to export a model who is made of different separated objects to MDD file for getting it into modo.

the problem is that mdd can export only one object and not several objects.
but i cant join all the objects into 1 object mesh because of the rig (each part of the mesh is linked and not skinned to the armature)

does any1 know if there is away to export mdd for more then one object. or maybe somehow to bake the whole animation into one single baked mesh (a script or something?) and then to export it into mdd?

any ideas?