DWG Export element ID


I'm trying to establish a link between Microstation and Autocad (dgn/dwg).

I would like to have a object based id that is the same in Autocad and Microstation

For example in Microstation each object has an ElementID, but from what i can find out this element id is lost when exporting to DWG

and the other way around, for example each object in Autocad has an handle, but this is nowhere to be found in Microstation.

I am able to write custom plugins for this type of work, but it seems there is no common ID / handle to establish an link between objects in dwg/dgn.

Best regards,