Import Rational Rose models to DM 6.0.4

I need to import several Rational Rose models into Design Manager (DM). I'm using CLM 6.0.4. My first approach was to use RSA to import the Rose models, and then import them into DM. However I found the following under CLM 6.0.3 documentation:

"Note: IBM Rational Software Architect Design Manager is not supported in Rational solution for Collaborative Lifecycle Management 6.0.3."
https://www.ibm.com/support/knowledgecenter/en/SSYMRC_6.0.3/com.ibm.jazz.repository.web.admin.doc/topics/c_license_mgmt_over.html

I suppose I would have to use Rhapsody for this task instead. But it seems that the last version of Rhapsody that supports Rose models import is 8.1.3 (https://www.ibm.com/support/knowledgecenter/en/SSB2MU_8.1.3/com.ibm.rhp.importing.doc/topics/rhp_c_dm_rational_rose_models.html). There is no documentation about this process in versions 8.1.4 and above.

The bottom line question is: How do I import Rose models into DM 6.0.4?

Thanks!