How to add a vNIC to a virtual machine deployed from a single vNIC vCAC blueprint.

For a small percentage of our virtual machines we have a requirement for two vNICs. I am trying to avoid creating a second blue print with two vNICs or putting two vNICs in our base blueprint. Our environment is vCAC 6.0.1.1 + vCO 5.5.1.1617127. My preference is for a vCAC/vCO solution. Yes, I do realize this can be done in PowerCLI -- I was just trying to keep the number of moving parts to a minimum.

Thanks.