I have no experience with the Datakit add-ins, but a quick read at their site tells me that features would not be imported.
The best way to have editable features is to install a copy of Inventor.
But even then I doubt the features would be reproduced exactly per the Inventor tree.
Have you investigated the use of the SW FeatureWorks add-in?
Have you tried using the Direct Editing functions?
Thank you so much. Option #3 works best for me.