There were various attempts at using this feature of plasma, but I don't believe any of them made it to a stable release, as they tended to make the results rather unstable under certain conditions. (I recall an early test of clustergroups by someone else that filled my age with copies of the willow limbs)
one of the attempts which I wrote worked around some features of standard drawablespans to use the same mesh data multiple times, rather than using actual clustergroups, however, things tended to break when using animations on these duplicated objects. I also tried exporting Odema once with it, but it just crashed horribly... though that isn't really surprising. <_< This modification is probably present in Paradox's contrib branch, (I've since lost the original modification due to a hard drive failure) but that's always been pretty incompatible with the stable branch.
In a word, no.
