Hi,
Unfortunately now in 6.0 there is no way for manual user interaction to be handled and redirected to a specific user or a group of users.
While you are searching for some type of leveled blueprint execution you can try if the approval functionality can fit into your requirements. A possible solution is to skip the user interaction from your workflow and the data for required fields to be hard-coded somewhere in vCO workflow presentation. The second step is before and after that blueprint execution to provide a permission to user/group to take the decision if the request is allowed or not.
Finally, I will take that discussion as a feature request and a backlog item will be created to track it as a proposal in future releases.
Thanks