Multiple NICS on hosted-engine

Is there a supported method for adding additional network interfaces to the RHEVM virtual machine in a hosted-engine configuration?

In my case it desirable for the engine VM to be accessible via a public network while having a separate private network to carry management traffic. Unfortunately, since the engine VM is not actually managed through the RHEV administration portal, the 'correct' method for making these kinds of modifications is somewhat difficult to define.

This is assuming a RHEV 3.5 installation using RHEL 6.7 hosts.